Question

In the figure AD=21cm, AB = BC = CD and find the area of shaded region

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Answer 1

Answer:

154.25cm squared

Step-by-step explanation:

you have three mini circles so 21÷3=7

so each mini circle has a diameter of 7 . you want the radius so 7 ÷ 2=3.5

Radius of mini circles: 3.5

Radius of whole circle: 10.5

area of whole circle:346.36 cm divide by two because its a semicircle.

area of semi circle:173.18

area of small mini circle:38.48 divide by two because its a semicircle.

if you you look carefully, you can move the outward mini circle to one of the hollow mini circles

now simply subtract your whole semicircle with your mini semicircle and you'll get the answer.