Question

a person pays rs2200 to some cldren below 14ye to paint the inner curved surface area of a cylinder vessel 10 metre deep. if the cost of painting is rate rs20per meter square find a) inner curved surface area of the base b) the radius of the base

Answer 1

cost = rate * area

2200= 20 * AREA [ INNER SURFACE AREA]

THEREFORE ARE = 2200/20


= 110 SQ.M

NOW INNER CSA = 2 PIE R H = 110

2* 22/7 * R * 10 = 110



THEREFORE RADIUS = 110 * 7/ 2*22*10

= 7/4 CM


SO a] inner csa = 110 sq. m and
b] radius = 7/4 = 1.45 c....


hope helped..