Question

find the volume and total surface area of hemisphere of radius 3.5cm ?

Answer 1

Given: Hemisphere Radius (r)= 3.5cm. Required to find =Total surface area and volume of the given hemisphere =? Total surface area = 3πr² = 3* 22/7* 3.5* 3.5 cm² =66/7* 3.5 *3.5 cm² =808.5/7 cm² =115 cm² Volume = 2/3πr³ =2/3* 22/7 * 3.5* 3.5* 3.5cm³ = 2/3* 22* 0.5* 3.5* 3.5* 3.6cm³ =44/3* 0.5* 3.5* 3.5cm³ =269.5/3 cm³ (44* 0.5* 3.5* 3.5 = 269.5) =89.8 cm³

Answer 2

The volume of a hemisphere is written as $\frac{2}3 \pi r ^3$.
The area of a hemisphere is written as $2 \pi r ^2$.

HemiVolume = $\frac{2}3 \pi (3.5) ^3$
HemiVolume = $\frac{2}3 (134.695)$
HemiVolume = $89.797$

HemiArea = $2 \pi r ^2$
HemiArea = $2 (38.484)$
HemiArea = $79.969$

Ans: Volume ≈ 89.797    SurfaceArea ≈ 79.969