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# A cylindrical pipe 50cm long with radius 7m has one end open. What is the total ...

### Question

A cylindrical pipe 50cm long with radius 7m has one end open. What is the total surface area of the pipe?

### Options

A) 749$$\pi$$m2

B) 700$$\pi$$m2

C) 350$$\pi$$m2

D) 98$$\pi$$m2

### Explanation:

Total surface area of the cylindrical pipe = area of circular base + curved surface area
= $$\pi$$r2 + 2$$\pi$$rh
= $$\pi$$ x 72 + 2$$\pi$$ x 7 x 50
= 49$$\pi$$ x 700$$\pi$$
= 749$$\pi$$m2

## Dicussion (1)

• Total surface area of the cylindrical pipe = area of circular base + curved surface area
= $$\pi$$r2 + 2$$\pi$$rh
= $$\pi$$ x 72 + 2$$\pi$$ x 7 x 50
= 49$$\pi$$ x 700$$\pi$$
= 749$$\pi$$m2