Question

the curved surface area of a cone who's base is 4 cm is 20π . what is the total surface are of the cone in terms of π​

Answer 1

Answer:

20π cm²

Step-by-step explanation:

Given:

Radius = r = 4 cm

Curved Surface Area of Cone = 20π

To Find:

Total Surface Area of Cone = ?

Calculation :

Formula:  Curved Surface Area of Cone = π$rl$

Where, l = Slant Height of the cone.

π$rl$ = 4πl

20π = 4πl

l = 5

Formula: Total Surface Area of Cone = πr (r + l)

TSA = π x 4 ( 4 x 5)

       = 20π cm²