Question

The radius of a cone is 4 cm and the height is 3 cm then find its CSA .Hey guys Help me.

Answer 1

Heya !!!!




Radius = 4 cm



Height= 3 cm



Slant height (L ) = ✓(H)² + (R)²



=> ✓(3)² + (4)² = ✓25



=> 5 cm



Therefore,



CSA of cone = πRL



=> 22/7 × 4 × 5




=> ( 22 × 4 × 5)/7


=> 440/7


=> 62.85 cm²



★ HOPE IT WILL HELP YOU ★

Answer 2

We're given that,
Radius of cone(r) = 4 cm
Height of cone(h) = 3 cm

Curved surface area of a cone = πrl

we have to find l,
By Pythagoras theorem
H² = P² + B²
here H = l, P = h, B = r
l² = h² + r²
l² = 3²+4²
l² = 9+16
l² = 25
hence, l =±5 cm
but, sides are never negative
therefore, l = 5cm

CSA of cone = πrl
= π×4×5
= π×20
= 20πcm²

Hope it helps you.!!