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A cylindrical pipe 50m long with radius 7m has one end op...

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

A.

749 $\pi$ m²

B.

700 $\pi$ m²

C.

350 $\pi$ m²

D.

98 $\pi$ m²

View answer & explanation

Correct answer is A

Total surface area of the cylindrical pipe = area of circular base + curved surface area

= $\pi$ r $^2$ + 2 $\pi$ rh

= $\pi$ x 7 $^2$ + 2 $\pi$ x 7 x 50

= 49 $\pi$ + 700 $\pi$

= 749 $\pi$ m $^2$

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