Questions · Page 2 of 2

1 Marks Question

Question 511 Mark
Every square is a parallelogram.
Answer
True.
Solution:
Every square is also a parallelogram as it has all the properties of a parallelogram but vice-versa is not true.
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Question 521 Mark
If diagonals of a quadrilateral are equal, it must be a rectangle.
Answer
True. Solution: If diagonals are equal, then it is definitely a rectangle.
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Question 531 Mark

is a polygon.
Answer
False.
Solution:
Because it is not a simple closed curve as it intersects with itself more than once.
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Question 541 Mark
Diagonals of rectangle bisect each other at right angles.
Answer
False. Solution: Diagonals of a rectangle does not bisect each other.
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Question 551 Mark
The measure of each angle of a regular pentagon is _____.
Answer
The measure of each angle of a regular pentagon is $108^\circ .$
Solution: We know that, the sum of interior angles of a polygon
​​​​​​​ $= (n − 2) \times 180^\circ .$
$= (5 − 2) \times 180^\circ $
$= 540^\circ $
Since, it is a regular pentagon.
​​​​​​​$\therefore$ Measure of each interior angle $=\frac{\text{sum of interior angles}}{\text{Number of sides}}=\frac{540^\circ}{5}=180^\circ.$
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Question 561 Mark
Every parallelogram is a rectangle.
Answer
False. Solution: As in a parallelogram, all angles are not right angles, while in a rectangle, all angles are equal and are right angles.
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Question 571 Mark
A rhombus is a parallelogram in which _____ sides are equal.
Answer
A rhombus is a parallelogram in which all sides are equal. Solution: As length of each side is same in a rhombus.
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Question 581 Mark

is a closed curve entirely made up of line segments. The another name for this shape is _____.
Answer


is a closed curve entirely made up of line segments. The another name for this shape is concave polygon.
Solution:
As one interior angle is of greater than $180^\circ .$
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Question 591 Mark
A polygon is regular if all of its sides are equal.
Answer
False.
Solution:
By definition of a regular polygon, we know that, a polygon is regular, if all sides and all angles are equal.
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Question 601 Mark
The sum of interior angles of a polygon of n sides is _____ right angles.
Answer
The sum of interior angles of a polygon of $n$ sides is $(2n − 4)$ right angles.
Solution: By the formula, sum of interior angles of a polygon of $?$ sides $= (n − 2) × 180^\circ= (2n − 2) × 90^\circ$.
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Question 611 Mark
Every square is a rhombus.
Answer
True.
Solution:
As a square possesses all the properties of a rhombus. So, we can say that, every square is a rhombus but vice-versa is not true.
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Question 621 Mark
The point of intersection of diagonals of a quadrilateral divides one diagonal in the ratio $1 : 2.$ Can it be a parallelogram? Why or why not?
Answer
No, it can never be a parallelogram, as the diagonals of a parallelogram intersect each other in the ratio $1 : 1.$
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Question 631 Mark
The number of sides in a regular polygon having measure of an exterior angle as $72^\circ $ is ______.
Answer
The number of sides in a regular polygon having measure of an exterior angle as $72^\circ $ is $5.$
Solution:
We know that, the sum of exterior angles of any polygon is $360^\circ$
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Question 641 Mark
The sum of interior angles and the sum of exterior angles taken in an order are equal in case of quadrilaterals only.
Answer
True.
Solution:
Since the sum of interior angles as well as of exterior angles of a quadrilateral are $360^\circ $
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Question 651 Mark
A quadrilateral can be drawn if all four sides and one angle is known.
Answer
True. Solution: A quadrilateral can be drawn, if all four sides and one angle is known.
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Question 661 Mark
A diagonal of a quadrilateral is a line segment that joins two _____ vertices of the quadrilateral.
Answer
A diagonal of a quadrilateral is a line segment that joins two opposite vertices of the quadrilateral. Solution: Since the line segment connecting two opposite vertices is called diagonal.
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Question 671 Mark
The diagonals of the quadrilateral $DEFG$ are _____ and _____.
Answer
The diagonals of the quadrilateral $DEFG$ are $GE$ and $FD.$
Solution:

The diagonals are.
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Question 681 Mark
A kite is not a convex quadrilateral.
Answer
False Solution: A kite is a convex quadrilateral as the line segment joining any two opposite vertices inside it, lies completely inside it.
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Question 691 Mark
All kites are squares.
Answer
False. Solution: As kites do not satisfy all the properties of a square. e.g. In square, all the angles are of $90^\circ $ but in kite, it is not the case.
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Question 701 Mark
Every trapezium is a rectangle.
Answer
False. Solution: Since in a rectangle, opposite sides are equal and parallel but in a trapezium, it is not so.
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Question 711 Mark
If one diagonal of a rectangle is 6cm long, length of the other diagonal is _____
Answer
If one diagonal of a rectangle is 6cm long, length of the other diagonal is square. Solution: If in a rectangle, adjacent sides are equal, then it is called a square.
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Question 721 Mark
All rectangles are parallelograms.
Answer
True. Solution: Since rectangles satisfy all “the” “properties” of parallelograms. Therefore, we can say that, all rectangles are parallelograms but vice-versa is not true.
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Question 731 Mark
The interior angles of a triangle are in the ratio $1 : 2 : 3,$ then the ratio of its exterior angles is $3 : 2 : 1.$
Answer
Given, ratio of interior angles $= 1 : 2 : 3$ Let the interior angles be $x, 2x$ and $3x$
So, $x + 2x + 3x= 180^\circ $
$6x=180^\circ $
$\text{x}=\frac{180^\circ}{6}=30^\circ$
$\therefore$The interior angles are $30^\circ , 60^\circ , 90^\circ $
Now, the exterior angles will be $(180^\circ - 30^\circ ), (180^\circ - 60^\circ )$ and $(180^\circ - 90^\circ )$
i.e., $150^\circ , 120^\circ $ and $90^\circ $ The ratio of exterior angles $= 150^\circ : 120^\circ : 90^\circ = 15 : 12 : 9 = 5 : 4 : 3.$
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Question 741 Mark
A quadrilateral can be constructed uniquely if its three sides and _____ angles are given.
Answer
A quadrilateral can be constructed uniquely if its three sides and two included angles are given. Solution: We cap determine a quadrilateral uniquely, if three sides and two included angles are given.
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Question 751 Mark
A quadrilateral can be constructed uniquely if three angles and any two sides are given.
Answer
True. Solution: We can construct a unique quadrilateral with given three angles given and two included sides.
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Question 761 Mark
A photo frame is in the shape of a quadrilateral. With one diagonal longer than the other. Is it a rectangle? Why or why not?
Answer
No, it cannot be a rectangle, as in rectangle, both the diagonals are of equal lengths.
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Question 771 Mark
All squares are rectangles.
Answer
True. Solution: Since squares possess all the properties of rectangles. Therefore, we can say that, all squares are rectangles but vice-versa is not true.
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Question 781 Mark
A quadrilateral can be drawn if all four sides and one diagonal is known.
Answer
True.
Solution:
A quadrilateral can be constructed uniquely, if four sides and one diagonal is known.
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Question 791 Mark
A quadrilateral that is not a parallelogram but has exactly two opposite angles of equal measure is _____.
Answer
A quadrilateral that is not a parallelogram but has exactly two opposite angles of equal measure is kite. Solution: By the property of a kite, we know that, it has two opposite angles of equal measure.
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Question 801 Mark
In quadrilateral $ROPE,$ the pairs of adjacent angles are _____.
Answer
In quadrilateral $ROPE,$ the pairs of adjacent angles are $\angle\text{R}, \angle\text{O}, \angle\text{O}, \angle\text{P}, \angle\text{E}, \angle\text{E}, \angle\text{R}.$ Solution:

The pairs of adjacent angles are.
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Question 811 Mark
If the diagonals of a quadrilateral bisect each other, it is a _____.
Answer
If the diagonals of a quadrilateral bisect each other, it is a parallelogram. Solution: Since in a parallelogram, the diagonals bisect each other.
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Question 821 Mark
A line $l$ is parallel to line m and a transversal $p$ interesects them at $X, Y$ respectively. Bisectors of interior angles at $X$ and $Y$ interesct at $P$ and $Q.$ Is $PXQY$ a rectangle$?$ Given reason.
Answer
False.
Solution:
As it has $6$ sides, therefore it is a concave hexagon.
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1 Marks Question - Page 2 - MATHS STD 8 Questions - Vidyadip