Triangle Congruence Naming
Terms in this set (16)
A triangle with one obtuse angle (an angle whose measure is over 90 degrees)
A triangle with three acute angles (three angles whose measures are less than 90 degrees)
A triangle with one right angle (an angle whose measure is 90 degrees)
A triangle with three congruent acute angles (three angles whose measures are each 60 degrees)
A triangle with three congruent sides
A triangle with two congruent sides
A triangle with no congruent sides
When classifying triangles by angle measures, the classifications are:
Acute triangle, Obtuse triangle, Right triangle, Equiangular triangle
When classifying triangles by side lengths, the classifications are:
Equilateral triangle, Isosceles triangle, Scalene triangle
In an equilateral triangle, how many (if any) angles are congruent?
In an isosceles triangle, how many (if any) angles are congruent?
In a scalene triangle, how many (if any) angles are congruent?
The sum of the angle measures of a triangle is:
Third Angles Theorem
If two pairs of angles in one triangle are congruent to pairs of angles in another triangle, then the third pairs are also congruent.
External Angle Theorem
The Exterior angle is congruent to the sum of the opposite angles.
The angles inside of the triangle that sum to 180 degrees.