the radius and height of a cone are in the ratio 4:3.tha area of the base is 154cm2.find the area of the curved surface area.
It is a easy question.
We have given the ratio of radius and height i.e 4 : 3
Let
Radius = 4x
Height = 3x
Slant Height = root [(4x)2 +(3x)2 ]=5x {Pythagoreus Theorem}
We know that
Area of Base = pie X radius2
154=22/7 X 16x2
--->x=1.75cm
Radius=7
Height =5.25cm
Slant Height =8.75cm
Curved Surface Area = pie X radius x slant height
=22/7 X 7 X 8.75
-->x=192.5cm2