Question

8. Find the cost of painting the upper surface of a sphere
of diameter 7 cm at the rate of 20 paise per cm^2
(FULL EXPLANATION)​

Answer 1

Step-by-step explanation:

T.S.A of sphere=4×pie × r^2

r=7/2cm

T.S.A of sphere= 4×22/7×7/2×7/2= 154cm^2

rate of cost of painting = 0.20paise × 154cm^2 = 30.8paise = 0.308 rupee