Question

find the perimeter of the shaded region if ABCD is a square of side 21 cm and APB and CPD are semicircle​

Answer 1

Hey folk....

I'm assuming that this is the diagram (see attachment).

Perimeter of shaded region

= Cirumferance of both semi-circles + 2(diameter)

= 2(2πr/2) + 2(21)

= (2)(22/7)(21/2) + 42

= 462 + 42

= 504 cm

Area of shaded region

= Area of square - 2(Area of semi-circle)

= (21)² - π(21/2)²

= 441 - (22/7)(441/4)

= 882/2 - 693/2

= 189/2

= 94.5 sq.cm//

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Hope it helps....

plzz mark as brainliest...