![]() A line segment or altitude that extends from the isosceles triangle's apex to its base's midpoint, is perpendicular to its base.The altitude on the hypotenuse of a right-angled isosceles triangle is half the length of the hypotenuse.In a right-angled isosceles triangle, two angles are always 45 degrees, and the third is 90 degrees (right angle).The altitude from the apex divides the isosceles triangle into two congruent right-angled triangles.One or two isosceles triangles are always similar.Two congruent base angles are also known as the isosceles triangle theorem (angle based). Angles opposite to the equal sides of the isosceles triangle are congruent to each other. ![]()
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