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Mathematics

Grade-7

Easy

Question

If the area of circle is 56.52 sq. cm. Determine the diameter of the circle.

4.63
8.46
2.89
6.58

hint Hint:

diameter = 2 x radius
area of the circle = $πr squared$

The correct answer is: 8.46

$A r e a equals pi r squared equals 56.52 r squared equals fraction numerator 56.52 over denominator 3.14 end fraction r squared equals 18 r squared space equals space 9 cross times 2 r space equals space square root of 9 space cross times square root of 2 straight r equals text 3×1.41 end text r space equals space 4.23 d i a m e t e r space equals space 2 space cross times space r a d i u s d space equals 2 cross times r d equals space 2 space cross times space 4.23 d space equals space 8.46 space c m.$

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