Question

A rangoli competition was organized for street children to tap their creative talents. A child used all eco-friendly material find the area used for making semi circular design. If they made on a square of side 1.8m what is the area of remaining portion?

Answer 1

Please see the attachment.

Answer 2

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Side of the square is 1.8 m
Diameter of the semicircle is = 1.8m
so Radius is D/2 =1.8/2. = 0.9 m
Area of the remaining portion = Area of square - Area of the semicircle
$= (side) {}^{2} - \frac{\pi \: r {}^{2} }{2} \\ = (1.8) {}^{2} - \frac{3.14 \times 0.9\times 0.9}{2} \\ = 3.24 - 1.27 \\ = 1.97 \: cm {}^{2}$
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