Question

The area of a circle is 616 cm. Find its diameter.
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Answer 1

Answer:

♠area of circle :πr²

616=22/7×r²

(616×7)/22 = r²

196=r²

√196=r

r =14

diameter: 2×radius=2×15=30 cm♠

•♠hope will help you♠

Answer 2

According to the information provided in the question.

It is stated in the preceding question that,

The presented information is an area of a circle $616cm^{2}$

We need to find the diameter of the circle.

As a result, the area of the circle is as follow,

$\begin{array}{l}a=\pi \times r^{2} \\r^{2}=\frac{a}{\pi} \\r=\sqrt{\frac{a}{\pi}} \\r=\sqrt{\frac{616}{\frac{22}{7} }} \\r=14.0028=14 \mathrm{~cm}\end{array}$

The diameter of the circle is,

$\begin{array}{l}d=2 r \\=2 \times 14 \\=28 \mathrm{~cm}\end{array}$

Hence the diameter is 28cm.

Note:-The area of a circle is 616 cmsq. Find its diameter.