Question

Calculate the curved surface area and total surface area of a cone whose radius of the base and height are in the ratio 5:12 and its volume is 2512cu.cm.

Answer 1

let the radius of the cone = 5x
height of the cone = 12x
volume of cone = 2512 =1/3πr²h
$\frac{1}{3}$ × $\frac{22}{7}$ × 25x² × 12x  =  2512
$\frac{88*25}{7}$ × x³ = 2512
x³ = 8
x = 2
radius = 10 cm
height = 24 cm
slant height² = 24² + 10²
l² = 676
l = 26

curved surface area = πrl
                                   = 22/7 × 10 × 26
                                   = 816.8 cm²
total surface area = curved surface area + πr²
                               = 816.8 + 314.2
                               = 1131 cm² 

Answer 2

Answer:

if we do it with 3.14 as π value than answer is not coming..... plz help