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# Geometry Ch.4 part 1

### Vocabulary for Chapter 4 - Congruent Triangles - (part 1)

TermDefinition
Triangle A polygon with three sides.
Scalene Triangle A triangle with no congruent sides.
Isosceles Triangle A triangle that has, at most, two congruent sides.
Equilateral Triangle A triangle with three congruent sides.
Acute Triangle A triangle with all three angles measuring between 0 & 90 degrees.
Right Triangle A triangle with one angle measuring 90 degrees.
Obtuse Triangle A triangle with one angle measuring between 90 & 180 degrees.
Equiangular Triangle A triangle with three congruent angles.
Vertex Angle The noncongruent angle opposite the base of an isosceles triangle.
Base Angles The two angles that are adjacent to the base of an isosceles triangle.
Base The noncongruent side of an isosceles triangle.
Legs The two congruent sides of an isosceles triangle.
Triangle Sum Theorem The sum of the measures of the angles of a triangle is 180 degrees.
Exterior Angle Theorem The measure of each exterior angle of a triangle equals the sum of the measures of its two remote interior angles.
Interior Angles The orginial angles of a polygon after the sides are extended.
Exterior Angles The angles that form linear pairs with the interior angles.
Created by: hillap