a rectangular strip of size 25cm × 7cm is rotated about the longer side. find the volume and whole surface area of the solid thus generated.
Answers
Answered by
5
Answer:
Step by step explanation:
We have,
Dimension of rectangular strip = 25 cm × 7 cm
When this strip is rotated about its longer side,
Height of cylinder becomes = 25 cm
Radius = 7 cm
∴ Total surface area of cylinder = 2πr (h+r)
= 2 × 22/7 × 7 (25 + 7)
= 2 × 22/7 × 7 × 32
= 1408 cm2
Hope it helps you mate..
Similar questions