Question

He ratio between the radius and height of a cone is 3:4. What is the curved surface area of thecone?

Answer 1

CSA OF CONE= 22/7×R×L

NOW R/H= 3/4=TAN THETA

DIVIDING BY A 5 ON LHS BOTH SIDES 3/5/4/5= SIN THEATA/COS THEATA

SO L= 5 (as L IS A SLANT HEIGHT )

R= 3

CSA = 22/7×5×3

=47.14 Square unit