Question

find the total surface area of a hemisphere if it's radius is 10.5cm​

Answer 1

first we have to substitute the given in the formula then we have to cancel and the multiply the final answer

Answer 2

The total surface area of hemisphere is 1093.5 cm².

Given data :

Radius = 10.5 cm

Curved surface area = 2 × π × (10.5)² = 2 × 22/7 × 110.25 = 693 cm²

Base area = π × (10.5)² = 346.5 cm²

Total surface area = Curved surface area + Base area

= (693+346.5) cm²

= 1093.5 cm² (answer)