Subject :IMO Class : Class 7
The given figure (not drawn to scale) shows a semi-circle centred at O and a rectangle. Find the total area of shaded parts.
A173.25 m2
B141.75 m2
C120.20 m2
D213.35 m2
Ans 1:
Class : Class 5
Ans 2:
Class : Class 8
area of rectangle = l*b
= 15*21 = 315 sq m
area of semi - circle = 1/2 * 22/7*r^2
=1/2* 22/7* 10.5^2=173.25 sq m
area of shaded region = area of rectangle - area of circle
= 315 - 173.25
= 141.75 sq m