Isosceles triangles may be obtuse or acute but never right

It is false. An isosceles triangle may be right or acute, but never obtuse.

False, because an isosceles triangle is a triangle that has two sides that are equal to each other. You can tell if a triangle is isosceles if two angles in the triangle are congruent to each other or equal. Angles in a triangle have to add up to 180 degrees. If one angle is 90 degrees then the other two other angles are 45 degrees which means the triangle is a right isosceles.

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