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Find the area of a semicircle with a radius of 5 cm?

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39 cm2

39.25 cm

39.25 cm2

39 cm

answer is C.

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Detailed Solution

Concept- We will first utilise the formula for the area of a semicircle, which is

\frac{π r^{2}}{2}

, and then we will insert the value of r that is specified in the question in this equation for the area of a semicircle before simplifying this expression for the area.
Area of circle

^
Area of semicircle is the half of the area of circle =

\frac{Π r^{2}}{2}

Area of semicircle

= π r 2 / 2

Given, Radius of the circle

= r = 5 cm

Substituting the value of radius

r

in the given formula for area of semicircle, we get
Area of semicircle

= 3.14 (5) 2 / 2

Area of semicircle

= 39.25

The area of a semicircle is

39.25 cm 2

.
Hence, the correct answer is option 3 .

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