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 right triangle
All triangles have to be 180 degrees so an isoceles is 180 degrees
An isosceles triangle
It is an isosceles triangle
That's an isosceles triangle.