Question

find the surface area and volumw of a beach ball of diameter 42cm

Answer 1

answer of beach ball question :

for a beach ball,
height =diameter =42
so ,radius will  be half of it=21 cm
∴r=21 cm
now,
let us consider π=3.14
so now ,
volume of the beach ball=4/3 π r³
                                       =4/3*3.14*21³
                                       =now,
                                       =4*3.14*3087
                                       =38772.72 cm³
so now,
surface area of beach ball=4 π r²
                                         =4 * 3.14 *441
                                         =4 * 1384.74
                                         =5538.96 cm²

ans : The volume of the beach  ball is 38772.72 cm³ and ,surface area of beach ball is 5538.96 cm²

Answer 2

d=42 cm,

then
r=42/2 = 21 cm,


therefore

Surface area of ball = 4πr²,

=4×22/7 × 21 × 21,

= 4×22×3×21,

= 5544 cm²,


volume of the ball=4/3πr³,

=4/3 × 22/7 × 21×21×21,

=4×22×7×3×21,

=38808 cm³