Question

find the area of semicircle of radius 4r

Answer 1

As we know that the semicircle is the half part of the circle, therefore, its semicircle will also becomes half.

Area of the semicircle = $\dfrac{1}{2}$ × π × r²

Radius = 4r ( Given )

$\therefore$

Area = $\dfrac{1}{2}$ × $\dfrac{22}{7}$ × (4r)²

Area = $\dfrac{11}{7}$ × 16r²

Area = 25.14r² unit²

Answer 2

Heya frnd... Here's ur solution!!!
hope this helps you... see the attached image ☺

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