Question

find the curved surface area and total surface area of a hemisphere of radius 21 cm​

Answer 1

Answer:

CSA = 2772 cm^2 and TSA = 4158 cm^2

Step-by-step explanation:

$Radius \ of \ hemisphere,r = 21 cm \\\\ Curved \ surface \ area \ of \ hemisphere = 2\pi r^{2} = 2 (\frac{22}{7})(21)^{2} = 2772 \ cm^{2} \\\\Total \ surface \ area \ of \ hemisphere = 3\pi r^{2} = 3(\frac{22}{7})(21)^{2} = 4158 \ cm^{2}$