A statement that is accepted as true without proof.
What is a Postulate
200
A triangle that has three congruent sides.
What is an Equilateral Triangle
200
Measures greater than 90° and less than 180°.
What is an Obtuse Angle
200
If two parallel lines are cut by a transversal, then the two pairs of alternate exterior angles and congruent.
What is the Alternate Exterior Angles Theorem
200
y=mx+b
What is Slope-Intercept Form
300
Two rays that have a common endpoint and form a line.
What is Opposite Rays
300
A triangle with one right angle.
What is a Right Triangle
300
Lines that intersect at 90° angles.
What are Perpendicular Lines
300
The sum of the angle measures of a triangle is 180°.
What is the Triangle Sum Theorem
300
m=y2-y1/x2-x1
What is Slope
400
A ray that divides an angle into two congruent angles.
What is an Angle Bisector
400
A triangle with three congruent acute angles.
What is an Equiangular Triangle
400
Two angles in the same plane with a common vertex and a common side, but no common interior points.
What are Adjacent Angles
400
If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent.
What is Side-Angle-Side (SAS)
400
(x1+x2/2, y1+y2/2)
What is the Midpoint Formula
500
A pair of adjacent angles that form a line.
What is a Linear Pair
500
A triangle with no congruent sides.
What is a Scalene Triangle
500
Lines that are not coplanar or parallel, and do not intersect.
What are Skew Lines
500
If two angles are supplementary to the same angle (or two congruent angles), then the two angles are congruent.