The formula below gives the area of a semi-circle, A, with a radius of r.
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The quadrilateral ABCD, with vertices <span>A(-2,3), B(9,3), C(5,6) and D(2, 6), is a trapezoid.
By definition, a trapezoid is a quadrilateral which has two parallel sides (These are called "bases"), but the other sides are not parallels. </span>
By definition, a trapezoid is a quadrilateral which has two parallel sides (These are called "bases"), but the other sides are not parallels. </span>