Question

4. 40°

Que. 3 A workman wants to paint the top and bottom portions of a cylindrical object. What is the total

surface area he would have to paint if it has a radius of 7 cm and a height of 10 cm?

1. 100π cm2

2. 98π cm2

3. 50π cm2

4. 105π cm2

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Answer 1

Answer:

option (4) is the right answer

Answer 2

Step-by-step explanation:

total surface area= area of top,+ area of bottom

= π× radius²+π×radius² = 2π× radius²

= 2π×7²= 98π cm²

thus area to painting= 98π option (2) is correct.