Question

A solid hemisphere has volume 230cm^3. (a) Calculate the radius of the hemisphere. [The volume, V, of a sphere with radius r is V = 4 /3 = π r^3 .]

Answer 1

`\large \boxed{\mathrm{4.79 \ cm}}`

Explanation:

The volume of a hemisphere is half the volume of a sphere.

The formula for the volume of hemisphere is V = 2/3πr³.

The volume is given.

230 = 2/3πr³

Solve for r or radius.

Multiply both sides by 3/2.

230 × 3/2 = 2/3πr³ × 3/2

345 = πr³

Divide both sides by π.

(345)/π = (πr³)/π

109.816910733 = r³

Take the cube root of both sides.

∛(109.816910733) = ∛(r³)

4.78876002459 = r

Answer 2

`\huge\boxed{r = 4.8\ cm}`

Explanation:

Since it's a hemisphere, the volume will be:

Volume of Hemisphere =
`(2)/(3) \pi r^3`

Given that Volume of hemisphere = 230 cm³

230 =
`(2)/(3) \pi r^3`

Multiplying both sides by 3

230 * 3 = 2πr³

690 = 2πr³

Dividing both sides by 2π

690 / 2π = r³

r³ = 109.8

Taking cube root on both sides

r = 4.8 cm