A triangle with a 90 degree angle.
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If none of the three angles of a triangle is ninety degrees, then it is not a right triangle
The two sides in a right triangle that form the right angle.
If you mean the symbol of a triangle, in math and science a triangle stands for change in
it means make something for example: construct a triangle then you would make a triangle.
The middle. Such as the center of a circle or triangle.