A sum invested on C.I. , amounts to Rs.6875 in 1 year and Rs 8318.75 in 3 years.
Calculate the rate percent and the sum
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Let O be the centre of the circle. Then, OA=OB=OD=r
Now, OC=r−2
and CD=6
Thus, in △ODC
OC
2
+CD
2
=OD
2
(r−2)
2
+6
2
=r
2
r
2
+4−4r+36=r
2
4r=40
r=10 cm
Area of semicircle =
2
πr
2
=
2
π(10)
2
=50π
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