The sum of the measures of the angles of a triangle is 180 degrees.
What is Angle Sum Theorem ?
100
Segment whose endpoints are midpoints of two sides of a triangle.
What is a midsegment?
100
undefined terms
What is point, line, and plane?
200
All three angles congruent
What is equiangular?
200
The measure of the third angle of a triangle if the sum of the other two is 100 degrees.
What is 80?
200
The two angles of one triangle are congruent to two angles of a second triangle, then the third angles are also congruent.
What is Third Angles Theorem ?
200
A segment that bisects an angle of a triangle with one endpoint at the vertex of the bisected angle and the other endpoint of the side of the triangle opposite the bisected angle.
What is an angle bisector?
200
The corners of a triangle are called this.
What is a vertex?
300
One right angle
What is right triangle?
300
True or False?
In a right triangle, the acute angles are always complimentary?
What is true?
300
Special case of Angle Sum Theorem
What is Corollary 1 (Equiangular Triangles) or 2 (Right Triangles)?
300
The segment whose endpoints are a vertex of a the triangle and a point on the line containing the opposite side so that the line formed is perpendicular to the opposite side.
What is altitude?
300
These types of angles are always congruent.
What is vertical angles?
400
One obtuse angle and all two sides congruent
What is obtuse isosceles triangle?
400
True or False?
The sum of the interior angles of a triangle is supplementary?
What is false?
400
The measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.
What is Exterior Angle Theorem?
400
The segment that is perpendicular to the side and cuts the side into two equal parts.
What is perpendicular bisector?
400
If two angles are supplementary to the same angle
What is congruent?
500
At least two congruent angles
What is isosceles triangle?
500
The sum of the two remote interior angles is equal to this.
What is the exterior angle?
500
The measure of the angles of an equiangular triangle.
What is 60 degrees?
500
The segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side.