Question

Which of the following is the surface area of the right cylinder below?

Answer 1

Answer:

if it is TSA- 396 or 395.64

if it is CSA- 88 or 87.92

Step-by-step explanation:

r=7

h=2

TSA= 2 pi r(r+h)

=2*22/7*7*9= 396

CSA= 2 pi r h

2*22/7*7*2=88

when you use pi as 3.14 instead of 22/7 you get the answer with the decimal symbol.. in such case the TSA would be 395.64 and CSA would be 87.92

Answer 2

Answer: C. $126\pi \text{units}^2$

Step-by-step explanation:

The surface area of right cylinder is given by :-

$S.A.=2\pi r(r+h)$

Given : Height : h=2 units

Radius : r= 7 units

The the surface area of the given right cylinder will be :-

$S.A.=2(\pi) (7)(2+7)\ \ \ \text{Put }\pi=3.14$

i.e. $S.A.=126\pi \text{units}^2$

Hence, the surface area of the right cylinder = $126\pi \text{units}^2$