Question

the sum of the radius and height of a cylinder is 18 cm and the perimeter of the base is 44 cm find the area of curved surface answer is​

Answer 1

perimeter of Base is 44cm

c = 2×22/7×r

44 = 2 × 22/7 × r

44 × 7 / 2 × 22 = r

r = 7

height of cylinder = 18 - 7 = 11 cm

CSA of cylinder = 22/7 × r ( h + r )

= 22/7 ×7 (11 + 7 )

= 22/7 × 7 (18)

= 22 × 18

= 396 cm^2