![]() ![]() 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? The perimeter of the isosceles triangle is equal to 2a + b, where a = length of the equal side, and b = base of the triangle.The area of an isosceles triangle using the side lengths can be calculated by using the formula Area (A) = b/4, where a = length of the equal side, and b = base of the triangle.The perpendicular drawn from the vertex angle bisect that angle and the side opposite to it.The perpendicular drawn from the vertex angle of an isosceles triangle acts as a line of symmetry that divides the triangle into two congruent triangles. ![]()
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