Question

pls anwer my question friends.......I will mark brainlest....for you...1 to 4 problems
I want correct and exact answer guys...

Answer 1

1. radius of sphere is give = 3.5cm
surface area of sphere = 4πr² =4×22/7×3.5²
= 1078/7
=154cm²
volume of sphere = 4/3πr³
= 4/3×22/7×3.5³
= 179.66cm³

2. As, given surface area of sphere= 7128/7 {converted your value }
A.T.Q

4πr²=7128/7
r² = 7128/4×7×π
r² = 7128×7/4×7×22
r² = 7128/88
r² = 81
r = √81
r = 9 cm

volume of sphere = 4/3πr³
= 4/3×22/7×9³
= 3054.85 cm³
3. this question is done in my copy
4. this question is also written in copy
GOOD LUCK BRO !!!!!!