Question

curved surface area of cone is 251.2 cm and radius of base is 8 cm find its slant height and perpendicular height

Answer 1

curved surface area of cone = 251.2 cm²
πrl = 251.2 cm²
3.14*8*l = 251.2
l = 251.2/3.14*8 = 10 cm
slant height = 10 cm
l² = h²+r²
(10)² - (8)² = h²
h² = 36 ⇒ h = 6 cm
Perpendicular height = 6 cm

Answer 2

Csa of cylinder than you will get l than you have both r and l you can easily get h