Question

Find the area of semicircle when the diameter is 20 cm ( use 3.14)

Answer 1

d/2=r
r=20/2=10
Area of circle =πr2=3.14*10*10=314
Then area of semi circle =314/2=157

Answer 2

GIVEN:

DIAMETER=20 CM
therefore,radius=1/2×20 cm=10 cm

FIND:

AREA OF SEMICIRCLE=?

SOLUTION:

AREA OF SEMICIRCLE=1/2×AREA OF CIRCLE
=1/2×pie×r^2
=1/2×3.14×10×10
=1/2×314
=157cm^2

Therefore,area of semicircle is 157cm^2

;-)HOPE IT HELPS!!!