Isosceles triangle have two equal angles
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An isosceles triangle has two equal angles and one different angle. The sum of the angles in any triangle is always 180 degrees. Therefore, the two equal angles in an isosceles triangle must add up to 180 degrees minus the different angle. So, each of the two equal angles in an isosceles triangle measures (180 - x) / 2 degrees.
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A triangle has three internal angles and three external angles, for a total of six angles.
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If all of the interior angles of the polygon add up to 180 degrees, then the polygon is a triangle.