Question

need help in this question pls​

Answer 1

Answer:

(a). CSA of cylinder = 402.12cm²

2πrh = 402.12

2×22/7×r×20 = 402.12

r = 402.12×7/2×22×20

r = 201.6×7/22×20

r = 1411.2/440

r = 14112/4400

r = 3.2cm approx

(b). TSA of cylinder = 2πr(r+h)

=2×3.14×3.2(3.2+20)

= 6.28×3.2(23.2)

= 20.096× 23.2

= 466.2272cm²

Hence, the

r = 3.2cm

TSA of cylinder = 466.2272cm²