We'll show you how to find the volume and surface area of a sphere. Example 1: Find the volume V = 4·π·r3           3 V = 4·π·(5)3           3 V = 523.6 cm3 Example 2: The volume is 1000 cm3. Find the radius V = 4·π·r3           3 1000 = 4·π·r3                3 3000 = 4·π·r3 238.73 = r3             6.2 = r   by doing a cube root on your calculator Example 3: Find the surface area SA = 4·π·r2 SA = 4·π·(8)2 SA = 804.2 cm2 Example 4: The surface area is 1500 cm2. Find the radius SA = 4·π·r2 1500 = 4·π·r2 119.37 = r2 10.9 = r Have a look at some unusual sphere problems >>> Resources Content, HTML & design by Bill Willis 2024