Question

The height of a cylinder is 80 cm and the diameter of its base is 7 cm. The whole surface area of the cylinder is 

A. 1837 cm² 

B. 1760 cm² 

C. 1942 cm² 

D. 3080 cm²

Answer 1

We know that, 

Total surface area of the cylinder = \(2\pi r\) (r + h) 

Given that, 

Diameter = 7 cm 

So, Radius = 3.5 cm 

Height = 80 cm 

Therefore, 

Total surface area = \(2\times\frac{22}{7}\times3.5\,(3.5+80)\)

= 22 (83.5) 

= 1837 cm² 

Hence, option A is correct