A semicircle is inscribed in a rectangle with area 144 square centimeters. In square cm, what is the area of the semicircle?

3 answers

The question does not make sense.

You can construct an infinite number of
rectangles that have an area of 144 cm².

141 cm x 1 cm

72 cm x 2 cm

36 cm x 4 cm etc.
They say it is 36Pi sq.cm
If whole semicircle lie in rectangle then width is equal radius of semicircle.

W = r

Length is equal diametar of semicircle.

L = d = 2 r

Area of rectanlgle:

A = L ∙ W

144 = 2 r ∙ r

144 = 2 r²

Divide both sides by 2

72 = r²

r² = 72

Area of circle:

A = r² ∙ π

Area of semicircle:

A = r² ∙ π / 2

A = 72 ∙ π / 2

A = 36 π cm²