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e-lub [12.9K]
3 years ago
7

What is the volume and total surface area of a sphere with the radius 2.25in?

Mathematics
2 answers:
alexira [117]3 years ago
6 0
The volume is 15.89625
viktelen [127]3 years ago
4 0

Answer:

Step-by-step explanation:

The formula for determining the volume of a sphere is expressed as

Volume = (4/3)πr³

Where

r represents the radius of the sphere.

π is a constant whose value is 3.14

From the information given,

radius = 2.25 inches

Volume = 4/3 × 3.14 × 2.25³

Volume = 47.69 inches³

The formula for determining the total surface area of a sphere is expressed as

Total surface area = 4πr²

Therefore

Total surface area = 4 × 3.14 × 2.25²

= 63.9 inches²

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Surface area of a cube = 486 square inches

Solution:

Given each side of a cube = 9 inches

Net of a cube has 6 squares.

Area of square = side × side

Area of 1 square = 9 × 9 = 81 square inches

Surface area of a cube = Area of 6 squares

                                      = 6 × (side × side)

                                      = 6 × 81

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Hence, surface area of a cube is 486 square inches.

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Step-by-step explanation:

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