2 Marks

Question 12 Marks

A closed shape has 20 equal sides and one of its sides is 3 cm. Find its perimeter

Answer

Number of equal sides in the shape = 20
One of its side = 3 cm
Perimeter = length of one side × Number of equal sides
∴ Perimeter = (3 × 20) cm
= 60 cm
∴ Perimeter = 60 cm

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Question 22 Marks

From one vertex of an equilateral triangle with side 40 cm, an equilateral triangle with 6 cm side is removed. What is the perimeter of the remaining portion?

Answer

If an equilateral triangle of side 6 cm is removed the perimeter
= (40 + 34 + 6 +34) cm
= 114 cm
Perimeter of the remaining portion = 114 cm

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Question 32 Marks

A piece of wire is 36 cm long. What will be the length of each side if we form a square

Answer

Given the length of the wire $=36 cm$ When a square is formed out of itThe perimeter of the square $=36 cm$
$4 \times$ side $=36$
side $=\frac{36}{4} \quad$ Side of the square $=9 cm$

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Question 42 Marks

A piece of wire is 36 cm long. What will be the length of each side if we form an equilateral triangle

Answer

Given the length of the wire $=36 cm$ When an equilateral triangle is formed out of it, its perimeter $=36 cm$
i.e., side + side + side $=36 cm$
$3 \times$ side $=36 cm$
side $=\frac{36}{3}$
$=12 cm$ One side of an equilateral triangle $=12 cm$

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Question 52 Marks

A square of side 2 cm is joined with a rectangle of length 15 cm and breadth 10 cm. Find the perimeter of the combined shape

Answer

Perimeter of the combined shape = Lengths of the outer boundaries
= (15 + 10 + 2 + 2 + 2 + 13 + 10) cm
= 54 cm
Perimeter = 54 cm

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Question 62 Marks

Find the perimeter of A scalene triangle with sides 7 m, 8 m, 10 m

Answer

Perimeter of a scalene triangle
= (7 + 8 + 10) m
= 25 m

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Question 72 Marks

Find the perimeter of An isosceles triangle with equal sides 10 cm each and third side is 7 cm

Answer

The three sides of the isosceles triangle are 10 cm, 10 cm and 7 cm
∴ Perimeter = (10 + 10 + 7) cm
= 27 cm

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Question 82 Marks

Find the perimeter of An equilateral triangle with side 6 cm

Answer

An equilateral triangle with side 6 cm
The sides of equilateral triangle are 6 cm, 6 cm and 6 cm
∴ Perimeter = (6 + 6 + 6) cm
= 18 cm

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Maths 2 Marks

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