What is an isosceles triangle and its properties?

In this lesson, you'll learn how an isosceles triangle's sides and angles make it unique. read more

Since the angles of a triangle add up to 180 degrees, the third angle is 180 minus two times a base angle, making the formula for the measure of an isosceles triangle's apex angle: A = 180 - 2b Where A is the apex measure and b is the measure of one base angle. read more

Properties of isosceles triangle ABC. 1. Isosceles triangle has two sides, b and c, and the two angles opposite them <B and <C equal. The third angle, <A, could be acute or obtuse. 2, If all three angles of ABC are acute, the circumcenter will lie inside the triangle. The sides a, b and c will be chords of the circle. 3. read more

An isosceles triangle is a triangle that has (at least) two equal side lengths. If all three side lengths are equal, the triangle is also equilateral. Isosceles triangles are very helpful in determining unknown angles. In an isosceles triangle, the two equal sides are called legs, and the remaining side is called the base. read more