The legs can be equal (see isosceles tangential trapezoid below), but they don't have to be.Įxamples of tangential trapezoids are rhombi and squares. As for other trapezoids, the parallel sides are called the bases and the other two sides the legs. It is the special case of a tangential quadrilateral in which at least one pair of opposite sides are parallel. In Euclidean geometry, a tangential trapezoid, also called a circumscribed trapezoid, is a trapezoid whose four sides are all tangent to a circle within the trapezoid: the incircle or inscribed circle. To find the perimeter of the isosceles trapezoid we have to add all the sides of the isosceles trapezoid.Trapezoid whose sides are all tangent to the same circle To find the area of the isosceles trapezoid we have to add the base sides or parallel sides and divide it by 2 and then multiply the result with height.Īrea of Isosceles Trapezoid = (sum of parallel sides/2) × h Perimeter of Isosceles Trapezoid The formulas to determine the isosceles trapezoid's area and perimeter are listed below. There are two main trapezoid formulas, they are: The parallel sides' midpoints are connected by a line segment that is perpendicular to the bases. 180° or supplementary is the product of all opposite angles.The length of the diagonals is constant.Other than the base, the remaining sides are all non-parallel and equal in length. ![]()
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