Sum of the angles of a polygon with 10 sides is

Acircle has a circumference of 28.36 units what is the diameter of the circle

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is