The circumference of a circle is 18.84 inches. ​What is the diameter of the circle, to the nearest inch?

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16