Question

pls anwer my question friends.......I will mark brainlest....for you...1 to 4 problems

Answer 1

1) radius = 3.5cm
Surface area = 4πr²
= 4×3.14×3.5×3.5
= 153.86 sq.cm

Volume = 4/3πr³
= 4/3 × 3.14 × 3.5³
= 4/3 × 42.87 × 3.14
= 134.6 × 4/3
= 179.02cm³

2) Surface area = 1018.2/7 = 1018.29 sq.cm

Surface area of sphere = 4πr²
1018.29 = 4×3.14×r²
1018.29 = 12.56r²
r² = 1018.29/12.56
r = √81.04 = 9.002cm

Volume = 4/3πr³
= 4/3×3.14×9.002³
= 4/3×3.14×729.49
= 4/3×2290.6
= 3046.5cm³

3) since a globe is a sphere...
d = 44cm,
r = d/2 = 44/2 = 22cm

Surface area = 4πr²
= 4×3.14×22×22
= 12.56×484
= 6079.04sq.cm

4)
radius of spherical ball = d/2 = 21/2 = 10.5cm

Surface area for one ball = 4πr²
= 4×3.14×10.5×10.5
= 12.56×110.25
= 1384.74sq.cm

Leather required for 5 balls = 1384.74×5
= 6923.7sq.cm