An isosceles triangle is a type of triangle that has two sides of equal length. The remaining side is known as the base and the two equal sides are known as the legs.
An isosceles triangle can be identified by its two equal sides and the two angles opposite those sides are also equal.
Some properties of an isosceles triangle include: having two equal sides, having two equal angles opposite the equal sides, having a base that is perpendicular to the equal sides, and having a line of symmetry through the vertex opposite the base.
The formula for finding the area of an isosceles triangle is A = (1/2)bh, where A is the area, b is the base, and h is the height. The height can be found by using the Pythagorean theorem, where h = √(leg^2 - (base/2)^2).
Some real-life examples of isosceles triangles include the roofs of houses, the wings of airplanes, and the sails of sailboats. They can also be seen in the shapes of flags, road signs, and musical instruments such as the violin.