An isosceles triangle has at least two equal sides. To find the third side, use a variation of the Pythagorean theory. Height equals the square root of b (b refers to one of the equal sides) squared minus one fourth times a squared (a refers to the non equal side).
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An isosceles triangle has 2 equal base angles and its height is perpendicular from its apex to the centre of its base
For all triangles: area = 1/2 * base * height
To find the circumradius of an isosceles triangle, the formula is:1/8[(a^2/h)+4h]in which h is the height of the triangle and a is the base of the triangle.
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For all triangles: area = 1/2 * base * height