Volume and surface area question math geometry?

1)

Surface area = 4 π r^2

= 4 π (2.4)^2

= 72.3823

Volume = (4/3) π r^3

= (4/3) π (2.4)^3

= 57.9058

2)

Surface area = 2(LW+LH+WH)

L= Length W= Width H= Height

Area = 2[(3)(5)+(3)(3)+(5)(3)]

= 2[15+9+15]

Area = 78

Volume = Length x Width x Height

= (3)(5)(3)

Volume = 45

1. find the volume and surface area of a sphere with a radius of 2.4

V = 4/3 pi r^3....................volume of sphere

= 4/3 * pi * (2.4)^3

= 50.91 cm^3

S = 4pir^2 ............... surface area of a sphere

= 72.38 cm^2

2. A large box has a dimensions of 3 ft × 5 ft × 3

V = 3 x 3 x 5

= 45 cm^3

A = 2(5 x 3) + 2(3 x 3) + 2(5 x 3).............. for a closed box

= 30 + 18 + 30

= 78 cm^2

A = 2(5 x 3) + 2( 3 x3 ) + 5 x 3...............for an open box

= 30 + 18 + 15

= 63 cm^2