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Where a and b are the parallel sides of trapezoid.
Area of an isosceles trapezoid math. A trapezoid has legs 8 cm each in length. The area of an isosceles trapezoid can be found in another way if known angle at the base and the radius of the inscribed circle. In order to find the perimeter add the length of all sides. The area is equal to the average of the two bases times the height.
The fact is that the center of the inscribed circle from where the radius originates is located exactly in the center of the trapezoid thus equalizing the height and diameter of the circle or doubled radius we can find the middle line from here we get the trapezoid area formula. Adjacent base angles of an isosceles trapezoid are supplementary which means they add to 180 degrees. Its bases are 10 cm and 15 cm respectively.
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