Vocabulary Geometry

Chapter 4/5 Part 1

1. A triangle with two congruent sides is an isosceles triangle.

2. A triangle with all sides congruent is an equilateral triangle.

3. A triangle with three different side lengths is a scalene triangle.

4. A triangle with all angles congruent is an equiangular triangle.

5. A triangle with three acute angles is an acute triangle.

6. A triangle with one obtuse angle is an obtuse triangle.

7. A triangle with one right angle is a right triangle.

8. A mathematical statement that must be proven before accepted is a theorem.

9. A theorem with a proof that follows as a direct result of another theorem is called a corollary.

10. The angle formed by the legs of an isosceles triangle is called vertex angle.

11. The interior angles of a triangle nonadjacent to a given exterior angle are called remote interior angles.

12. An angle formed by a side of a polygon and the extension of an adjacent side is an exterior angle.

13. The angle formed by two adjacent sides of a polygon is an included angle.

14. The side located between two consecutive angles of a polygon is an

included side.

15. Polygons with congruent corresponding sides and angles are

congruent polygons.

16. The two angles attached to the base of an isosceles triangle are called

base angles.