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Vocabulary for Geometry_2.1

acute triangle A triangle in which all the angles are acute angles.
equilateral triangle A triangle with all sides congruent.
isosceles triangle A triangle with at least two sides congruent. The congruent sides are called legs. The angles opposite in the legs are base angles. The angle formed by the two legs is the vertex angle. The side opposite the vertex angle is the base.
obtuse triangle A triangle with an obtuse angle.
Polygon Interior Angles Sum The sum of the interior angle measures of an n-sided convex polygon is (n-2)ยท180.
right triangle A triangle with a right angle. The opposite the right angle is called the hypotenuse. The other two sides are called legs.
scalene triangle A triangle with no two sides congruent.
Triangle Angle-Sum Theorem The sum of the measures of the angles of a triangle is 180.