![]() 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.The base sides are the only pair of sides that are parallel.An isosceles trapezoid only has one line of symmetry connecting the middle of the parallel sides and no rotational symmetry. The image below indicates that c and d are equal in lengths, while the opposite sides a and b (bases of the trapezoid) are parallel to one another.Īn isosceles trapezoid has the following characteristics:. ![]() If the two opposite sides (bases) of the trapezoid are seen to be parallel, and the two non-parallel sides are of equal lengths, then it is known as an isosceles trapezoid. ![]()
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