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Area of an isosceles triangle sides3/1/2024 So, if any one of the angles of an isosceles is known to us, then we can easily deduce the rest of the angles by using the angle sum property of the triangle.įor example, let the measure of the unequal angle of an Isosceles triangle be 80°. The unequal angle of a right isosceles triangle is always 90°. The third angle, also known as the apex angle, is unequal. The perpendicular line from the apex angle to the base divides the isosceles triangle into two congruent triangles, thus this perpendicular line is also known as its line of symmetry.Īs mentioned above, the angles opposite to the equal sides of an isosceles triangle are equal in measurement. ![]()
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