This week we have been learning about central angles, circumference, and diameters and the formulas and new vocabulary. We also have been learning what a radius,diameter, and chord is and how to name them. Circumference has two formulas C=2 pie (radius) & C=pie d, &.An circumference is a measurement of the out side circle. There are two ways to solve the problem. When you are solving for radius you use C=2 pie r formula. For example C=2 pie, C= 60 pie,C= 188.496 ft. Method two you use this  formula C= d pie when you are trying to found diameter for example d=2(30),d=60 now we can use C=d pie C=60 pie, C= 188.496 ft.