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Q: Is it true that isosceles triangles have to have acute angles?

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The two acute angles are always equal.

the answer is true, apex

true

No, it is not true.

nope

Yes, it is true that an isosceles triangle can be acute or obtuse. As long as a triangle has two equal angles and two equal sides, it is isosceles. That situation can occur in both acute (all angles less than 900) and obtuse (one angle more than 900) triangles. Examples are a triangle with the angles being 75-75-30 degrees (acute) and one having angles of 120-30-30 (obtuse). Of course the sides of the angles that are equal would also be equal, so both examples are of isosceles triangles.

All acute triangles have 3 interior angles and 3 exterior angles. This is true for all triangles.

They can be any size. The only unchanging 'fact' which is true about all isosceles triangles is that two of them are equal.

True

Yep. All equilateral triangles are isosceles triangles.

Not true. A triangle with angles of 90, 45 and 45 is a right angled isosceles triangle. If you take a square piece of paper and fold it in half - from corner to corner - you will get this shape.

No

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