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# Bradfield Geom Ch 4

### Geometry Congruent triangles

Third Angle Theorem If two angles of one triangle are congruent to two angles of another triangle, then the third angles are congruent.
legs of an isosceles triangle the congruent sides of an isosceles triangle
base of an isosceles triangle The non-congruent side of an isosceles triangle
Vertex Angle of an isoscels triangle the angle formed by the two congruent sides of an isosceles triangle
Base Angles of an isosceles triangle The congruent angles adjacent to the base of an isosceles triangle.
Isosceles Triangle Theorem If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
Theorem: Equilateral triangles The angles of an equilateral triangle are all 60 degrees.
Hypotenuse of a triangle The longest side of a right triangle.
Legs of a triangle The two sides of the right triangle other than the hypotenuse. These sides form the right angle.
Scalene triangle A triangle with no congruent sides
Isosceles Triangle A triangle with 2 congruent sides
Equilateral triangle A triangle with THREE congruent sides
Acute triangle A triangle with 3 acute angles
Obtuse triangle A triangle with ONE obtuse angle
Right triangle A triangle with ONE right angle
Equiangular triangle A triangle with 3 congruent angles (all are 60 degrees)
Perpendicular bisector a line that is perpendicular to a segment and goes through its midpoint(bisects the segment)
Created by: BGuice