1 Marks Question

Question 11 Mark

Write $'T'$ for true and $'F'$ for false. Area of a circle $=2\pi\text{r}^2.$

Answer

False.
Area of a circle $=\pi\text{r}^2$

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Question 21 Mark

Write $'T'$ for true and $'F'$ for false. Area of $a\ ||\ gm$ = (base $\times $ height)

Answer

True.

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Question 31 Mark

Write $'T'$ for true and $'F'$ for false. Area of a triangle = (base $\times $ height)

Answer

False.
Area of a triangle $=\frac{1}2{}\times\text{Base}\times\text{Height}$

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Question 41 Mark

Write $'T'$ for true and $'F'$ for false.
Circumference of a circle $=2\pi\text{r}.$

Answer

True.

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Question 51 Mark

Fill in the blanks. If $l, b$ and $h$ be the length, breadth and height respectively of a room, then area of its $4$ walls = sq units.

Answer

If $l, b$ and $h$ be the length, breadth and height respectively of a room, then area of its $4$ walls $= [2h(l + b)]$ sq units.

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Question 61 Mark

Fill in the blanks.
$1 \text { hectare }= \mathrm{~m}^2$.

Answer

$1 \text { hectare }=\underline{10000} \mathrm{~m}^2$.
$\text { since } 1 \text { hecta metre }=100 \mathrm{~m}$
$1 \text { hectare }=(100 \times 100) \mathrm{m}^2$
$=10000 \mathrm{~m}^2$

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Question 71 Mark

Fill in the blanks.
If $d_1$ and $d_2$ be the diagonals of a rhombus, then its are is sq units.

Answer

If $d_1$ and $d_2$ be the diagonals of a rhombus, then its are is $\frac{1}{2} d_1 d_2$ sq units.

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Question 81 Mark

Fill in the blanks.
$1$ are $=\mathrm{~m}^2$.

Answer

$1$ are $=\underline{100} \mathrm{~m}^2$.

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Question 91 Mark

Fill in the blanks.
If each side of a triangle is a $cm$, then its area = $cm^2$.

Answer

If each side of a triangle is a $cm$ , then its area $=\frac{\sqrt{3}}{4} \mathrm{a}^2 \mathrm{~cm}^2$.

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