1 Marks Question

Question 11 Mark

Find the area of a circle of radius 35 cm.

Answer

Radius $(r)=35 cm$
Area of circle $=\pi r^2=\frac{22}{7} \times 35^2=3850 cm^2$

Question 21 Mark

Diameter of circular plate is 7 cm . Find its area.

Answer

Diameter $(d)=7 cm$
Then, radius $(r)=\frac{d}{2}=\frac{7}{2} cm$
Area of circle $=\pi r^2$
$
\begin{array}{l}
=\frac{22}{7} \times\left(\frac{7}{2}\right)^2 \\
=\frac{22 \times 7}{4}=38.5 cm^2
\end{array}
$

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Question 31 Mark

What is the radius of circle having circumference 176 cm.

Answer

Circumference of a circle $=2 \pi r$
$
\begin{aligned}
176 & =2 \times \frac{22}{7} \times r \\
\Rightarrow \quad r & =\frac{7 \times 176}{2 \times 22}=28 cm
\end{aligned}
$

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Question 41 Mark

What is the circumference of a circle of radius 7 cm.

Answer

$\text {Circumference of a circle} =2 \pi r $
$ =2 \times \frac{22}{7} \times 7 $
$ =44\text{ cm}$

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Question 51 Mark

Find the height of triangle with base 4 cm and area $12 cm^2$.

Answer

$\text {Area of triangle} =\frac{1}{2} \times \text {Base} \times \text {Height} $
$ 12 =\frac{1}{2} \times 4 \times \text {Height} $
$ \Rightarrow \quad \text {Height} =\frac{12 \times 2}{4}=6\text{ cm}$

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Question 61 Mark

Find the area of triangle with base 5 cm and height 40 cm.

Answer

$\text {Area of triangle} =\frac{1}{2} \times \text {Base} \times \text {Height} $
$ =\frac{1}{2} \times 5 \times 40=100 cm^2$

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Question 71 Mark

Find the base of parallelogram with area $84 m^2$ and height 7 m.

Answer

$\text {Area of parallelogram}= \text {Base} \times \text {Height} $
$ \Rightarrow \text {Base of parallelogram} =\frac{\text {Area}}{\text {Height}} $
$=\frac{84}{7}=12 \text m$

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Question 81 Mark

Find height of parallelogram with base 15 cm and area 105 cm.

Answer

$\text {Area of parallelogram}=\text {Base} \times \text {Height}$
$\Rightarrow \text {Height of parallelogram}=\frac{\text {Area}}{\text {Base}}=\frac{105}{15}=7\text{ cm}$

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Question 91 Mark

Find area of parallelogram with base 10 cm and height 5 cm.

Answer

Area of parallelogram $=$ Base $\times$ Height $=10 \times 5=50 cm^2$

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