What is the length of the radius of a sphere with a diameter of 12 cm?(1 point)
cm
The radius of a sphere is half of its diameter. Therefore, the length of the radius of a sphere with a diameter of 12 cm is 6 cm.
Find the surface area of a sphere with a diameter of 40 inches. Leave your answer in terms of pi.(1 point)
The surface area is
in.2
The formula for the surface area of a sphere is given by: A = 4πr^2.
Given the diameter of 40 inches, the radius (r) is half of the diameter, which is 20 inches.
Substituting the radius into the formula: A = 4π(20^2) = 4π(400) = 1600π.
Therefore, the surface area of the sphere is 1600π square inches.
Find the surface area of a sphere with a radius of 3.6 ft. Use 3.14 for pi. Round your answer to the nearest hundredth, if necessary.(1 point)
The surface area is
ft.2
The formula for the surface area of a sphere is given by: A = 4πr^2.
Given the radius of 3.6 ft, we can substitute it into the formula: A = 4π(3.6^2).
Using the value of pi as 3.14: A = 4(3.14)(3.6^2) = 4(3.14)(12.96) = 162.3744.
Rounding this to the nearest hundredth, the surface area of the sphere is approximately 162.37 square feet.