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Q: Do all triangles have a right angle?

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only right tringles or HL triangles have at least 1 right angle

Not all triangles have 1 right angle but they can have a maximum of 1 right angle.

All right angle triangles

yes all right angle are congruent.

Right angled triangles!

No. Only right triangles do, and not all triangles can be right triangles. Equilateral triangles, for example, are always 60°-60°-60°. Isosceles and scalene triangles can be right triangles; all isosceles triangles have the additional useful property of being able to be split into two right triangles.

No, right triangles do not.

All right angle triangles have a 90 degree angle and two acute angles that add up to 90 degrees

An isosceles triangle may have a right angle, but a right angle is not a requirement of all isosceles triangles.

No it can only be used with right angle triangles.

All right angle triangles have a 90 degree angle and two acute angles which all together the 3 angles add up to 180 degrees.

No because 30-60-90 triangles are right angle triangles

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