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# chapter 5

### classifying triangles

what is a triangle? a figured formed by 3 noncollinear points connected by segments.
what is the vertex of a triangle? the vertex of each angle is a vertex of the triangle
what is an isosceles triangle an isosceles triangle has at least 2 congruent segments and two base angles.
what is the vertex of an isosceles triangle? the vertex is the angle formed by the two congruent legs of that triangle and it is opposite of the base
what is a scalene triangle? a scalene triangle is a triangle that has no congruent sides.
what is an equilateral triangle? an equilateral triangle is a triangle that all the lengths of the segments are congruent.
are all equilateral triangles also isosceles triangles? yes!
what is an acute triangle? a triangle where all angles are less then 90 degress
what is an obtuse triangle? a triangle where one one angle is greater then 90.
what is a right triangle? a triangle that has one angle that is 90 degress.
what is the sum of the measures of the angles of a triangle? 180 degress
are the acute angles of the right triangle complementary? what does this mean? yes, it means that the two angles add up to 90 degress
what do we know about all three angles in an equiangular triangle? all three angles are congruent. they all equal 60 degress