Example 1: Find the volume V = 4·π·r^{3} 3 V = 4·π·(5)^{3} 3 V = 523.6 cm^{3} Example 2: The volume is 1000 cm^{3}. Find the radius V = 4·π·r^{3} 3 1000 = 4·π·r^{3} 3 3000 = 4·π·r^{3} 238.73 = r^{3} 6.2 = r by doing a cube root on your calculator Example 3: Find the surface area SA = 4·π·r^{2} SA = 4·π·(8)^{2} SA = 804.2 cm^{2} Example 4: The surface area is 1500 cm^{2}. Find the radius SA = 4·π·r^{2} 1500 = 4·π·r^{2} 119.37 = r^{2} 10.9 = r |