The base of an isosceles triangle is the third side which is the unequal side. What is the Base of an Isosceles Triangle? The vertex angle is also known as the apex angle of the triangle. It connects the two equal sides of that triangle. The vertex angle of an isosceles triangle is the angle other than the two equal sides. What is the Vertex Angle of an Isosceles Triangle? The isosceles triangle perimeter can be found by using the formula P = 2a + b, where b is the base and a is the length of the equal side. The perimeter of any triangle is the sum of all its three sides. What is the Perimeter of Isosceles Triangle?
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