A hemisphere has 42 cm diameter. Find its curved surface area and the…

We know that,

Curved surface area = 2πr²

The total surface area = 3πr²

Diameter of the hemisphere = 42 cm

Radius of hemisphere = \(\frac{42}{2}\) = 21 cm

CSA = 2π(21)² 

= CSA = 2(\(\frac{22}{7}\))(441) 

= CSA = \(\frac{19404}{7}\) = 2772 cm² 

Now , TSA = 3π(21)² 

= TSA = 3(\(\frac{22}{7}\))(441) = \(\frac{29106}{7}\) = 4158 cm²