The use of isosceles triangles in these structures allows for stability and uniformity. Architecture: Isosceles triangles are commonly used in architecture, particularly in the construction of pyramids, roofs, and arches.The base angles of an isosceles trapezoid are equal, but the non-base angles are not equal. Isosceles trapezoid is a quadrilateral with two parallel sides that are equal in length, and two non-parallel sides that are not equal in length.The vertex angle of an obtuse isosceles triangle is always less than 90 degrees but greater than the base angles. An obtuse isosceles triangle is a triangle where one angle is obtuse, and the other two angles are acute.The vertex angle of an acute isosceles triangle is always greater than 45 degrees.
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