The formula for the surface area of a sphere is 4πr^2, where r is the radius of the sphere. Plugging in the radius of 7cm, we get 4π(7)^2 = 4π(49) = 196π. Therefore, the surface area of a sphere with a radius of 7cm is 196π square centimeters.
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The volume of a sphere is given by the formula V =⁴⁄ ₃πr3The volume of a sphere with radius 7cm = ⁴⁄ ₃π73 = 1436.76 cm3 (to 2 dps)
A cone with a slant height of 22cm and radius of 7cm has a total surface area of about 637.74cm2
153.94 square cm
Area of the circle: pi*7squared = 153.93804 square cm
7cm; the diameter of a circle is twice its radius.