The surface area of the hemisphere (A) is the sum of the half of the surface area of the sphere (A1) and the area of the base which is a circle (A2) A = 1/2A1 + A2
The surface area of the sphere (A1) with radius r is: A1 = 4 π r²
The area of a circular base with radius r is: A2 = π r²
A = 1/2A1 + A2 A = 1/2 * 4 π r² + π r² A = 2 π r² + π r² A = 3 π r²
We know: r = 5 cm A = 3 π * 5² A = 3 π * 25 A = 75π
