Question

Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find the curved
surface area

Answer 1

Answer: 165 cm^2

Step by Step explanation

THE CURVED SURFACE AREA PF A CONE IS

2πrl = l = h = 10 cm ,r = 10.5/2= 5.25

2×22/7×5.25×10 = 165 cm^2 answer

Answer 2

Answer:

The lateral surface area of the cone is 164.85 cm².

Step-by-step explanation:

Given:

Diameter of the base of cone = 10.5 cm

The slant height of the cone = 10 cm

To find out:

The curved surface area of the cone.

Solution:

 The formula to find the curved surface area (S) of the cone is given as,

      S = πrl

Where 'r' is the radius of the base which is the half of the diameter, 'l' is the slant height and the value of π = 3.14.

r = 10.5 ÷ 2 = 5.25 cm

By substituting the values we get,

     S = 3.14 × 5.25 × 10

        = 164.85 cm²

Hence the lateral surface area of the cone is 164.85 cm².