Question

find the value of right circular cone with radius 8cm and height 21cm​

Answer 1

The area of a right-angled cone is 763.65 cm².

Step-by-step explanation:

The area of a right-angled cone can be calculated by;

$area = \pi r (r + \sqrt{ r^2 + h^2} )$

r = radius of the cone

h = height of the cone

substituting;

$area = \pi * 8 (8 + \sqrt{ 8^2 + 21^2} )$

$area = \pi * 8 (30.4 )\\area = 3.14 * 8 * 30.4\\area = 763.65 cm^2$