Chapter 5 Flashcards
what is a scalene triangle?
a triangle with no congruent sides.
what is an isosceles triangle?
a triangle with two congruent sides.
what is an equilateral triangle?
a triangle with all three sides congruent.
what is an acute triangle?
a triangle with three acute sides.
what is a right triangle?
a triangle with one right angle.
what is an obtuse triangle?
a triangle with one obtuse angle.
what is an equiangular triangle?
a triangle with all three sides congruent.
what do exterior angles need to be considered one?
they have to form a linear pair with an interior angle
what is theorem 5.1?
triangle sum theorem
what does the triangle sum theorem say?
the sum of the measure of the interior angles of a triangle is 180.
what is theorem 5.2?
exterior angle theorem
what does the exterior angle theorem say?
the measure of an exterior angle of a triangle equal to the sum of the measures of the two nonadjacent interior angles.
what is theorem 5.6?
base angle theorem
what does the base angle theorem say?
if two sides of a triangle are congruent, then the angles opposite them are congruent.
what is theorem 5.7?
the converse of base angles theorem