1: 3.169 2: 5.6487 3: 8.6487 4: 9.1435

True or false? a triangle can be circumscribed about a given circle

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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).