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### 22 Cards in this Set

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 equilateral triangle A triangle with all sides congruent. isosceles triangle A triangle with at least two sides congruent. scalene triangle A triangle with no sides congruent. acute triangle A triangle with tree acute angles. equiangular triangle A triangle with all angles congruent. right triangle A triangle with one right angle. obtuse triangle A triangle with one obtuse angle. vertex of a triangle each of the three points joining the sides of a triangle adjacent sides of a triangle two sides of a triangle with a common vertex legs of a right triangle in a right triangle, the sides the form the right angle hypotenuse In a right triangle the side opposite the right angle. The other two sides are called legs. legs of an isosceles triangle The two congruent sides. The third side is the base. base of an isosceles triangle the non-congruent side of an isosceles triangle that had only two congruent sides interior angle the angles inside the shape exterior angle the angles outside the shape corollary A statement that can be proved easily by applying the theorem. congruent there is a correspondence between their angles and sides corresponding angles Two angles in corresponding positions relative to two lines. corresponding sides congruent sides base angles the two angles adjacent to the base vertex angle the angle opposite the base coordinate proof a type of proof that involves placing geometric figures in a coordinate planes