Isosceles Triangle
a triangle with at least two congruent sides
An isosceles triangle is a triangle in which two of its sides are equal in length. This means that two of its angles are also equal in measure, while the third angle can be different. The equal sides are called the legs of the triangle, while the third side is called the base.
Some properties of isosceles triangles include:
– The altitude from the base of an isosceles triangle bisects the base and the vertex angle.
– The perpendicular bisector of the base of an isosceles triangle also bisects the vertex angle.
– The median from the vertex angle of an isosceles triangle is also an altitude and bisects the base.
– The sum of any two angles in an isosceles triangle is greater than the third angle.
There are also special types of isosceles triangles, such as the equilateral triangle, which has three equal sides and three equal angles, all measuring 60 degrees.
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