For the area of a circle you need just its radius. There exist more distinctions and classifications for different types of trapezoids but their areas are still calculated in the same manner using the following equation. Area of a circle radius.
Area of circle can be calculated by using the formulas.
Given the radius of a circle calculate the area circumference and diameter. Where A Area of Semicircle r Radius. A 314 x 1 x 1. Notice that the calculated area of the circle is same in both the methods.