Slant height is 39.98 cm
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The radius is 32 because the height of the hemisphere (which is half of a sphere) is the same thing as the radius (which is half the length of the diameter); the radius is the distance from the center to any point on the edge or surface of the circle/sphere.
It depends on what information you have: its radius and slant height, radius and volume, radius and surface area, surface area and volume, etc.
The surface are of a cylinder whose radius is 10cm and height is 20cm is 1884.96cm2
The height of a cylinder with a radius of 8 and a surface area of 954.56 is 10.99
The surface area of a cylinder with a radius of 15in and a height of 34in is 4,618.14in2