Question

EXERCISE 12.4
1. Find the total surface area of a solid cylinder with radius 13.3 cm and height 10.5 cm respectively

Answer 1

A≈1988.88cm²

r Radius

13.3

cm

h Height

10.5

cm

Answer 2

Find :

The Total Surface Area of the Cylinder.

Given :

Height = 10.5 cm

Radius = 13.3 cm

π = 22/7

We Know :

"Total Surface area of a Cylinder"

Where,

TSA = Total Surface Area of the Cylinder

r = Radius of the Cylinder

h = Height of the Cylinder

Solution :

Using the formula for Total Surface Area of a Cylinder , and by substituting the values in it , we get :

⟹TSA=2×

7

22

×13.3(10.5+13.3)

⟹TSA=2×

7

22

×13.3×23.8

⟹TSA=2×22×1.9×23.8

⟹TSA=1989.68

∴TSA=1989.68cm

2

Hence , the Total Surface Area of the Cylinder is 1989.68 cm².