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# Geometry Chapter 4

### Mcdougal Littell Vocab.

A triangle with three congruent sides. equilateral triangle
A triangle with at least two congruent sides. isosceles triangle
A triangle with no congruent sides. scalene triangle
A triangle with three acute angles. acute triangle
A triangle with three congruent angles. equiangular triangle
A triangle with one right angle. right triangle
A triangle with one obtuse angle. obtuse triangle
Each of the three points joining the sides of a triangle. vertex of a triangle
Two sides of a triangle with a common vertex. adjacent sides of a triangle
In a right triangle, the sides that form the right angle. legs of a right triangle
In a right triangle , the side opposite the right angle. hypotenuse
The two congruent sides of an isosceles triangle that has two congruent sides. legs of an isosceles triangle
When the sides of a triangle are extended, the three original angles of the triangle. interior angle of a triangle
When the sides of a triangle are extended, the angles that are adjacent to the interior angles. exterior angles of a triangle
A statement that can be proved easily using a theorem or a definition. corollary
there is a correspondence between their angles and sides congruent
When two figures are congruent, the angles that are in corresponding positions and are congruent. corresponding angles of congruent figures
When two figures are congruent, the sides that are in corresponding positions and are congruent. corresponding sides of congruent figures
The noncongruent side of an isosceles triangle that has only two congruent sides. base angles of an isosceles triangle
The angle opposite the base of an isosceles triangle. vertex angle of an isosceles triangle
A type of proof that involves placing geometric figures in a coordinate plane. coordinate proof
Created by: dhmahlman