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The interior angles of a triangle always add up to 180 degrees. If you make one angle bigger, another angle will become smaller: The exterior angles of a triangle always add up to 360 degrees: In every triangle, the shortest side is always opposite the smallest interior angle. The longest side is always opposite the largest interior angle. âOppositeâ means that the side does not touch the point of the angle on either end. Equilateral triangles must have three angles of 60 degrees each, and all triangles with three 60 degree angles are equilateral.
The theorem states that the hypotenuse of a right triangle can be easily calculated from the lengths of the sides. The hypotenuse is the longest side of a right triangle. If you're given the lengths of the two sides it is easy to find the hypotenuse.nswer : Finding the missing side of a right triangle is a pretty simple matter if two sides are known. One of the more famous mathematical formulas is [tex]a^2+b^2=c^2[/tex], which is known as the Pythagorean Theorem.