Hi Nicholas,

The surface area of a sphere of radius r is 4 π r². Half of this is 2 π r². If this is what is meant by the surface area of a hemisphere then 2 π r² = 1062. Solve for r.

If you have a hemispherical object then it has a base which is a circle of radius r.

The area of a circle of radius r is π r² and thus if the hemisphere is meant to include the base then the surface area is 2 π r² + π r² = 3 π r². Hence in this case 3 π r² = 1062. Solve for r.

Penny