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Classifying Triangles and the Exterior Angle Theorem
There are two ways to classify triangles – by sides and by angles.
Scalene
*No congruent sides
Isosceles
*at least 2 congruent sides
Acute
Right
*3 acute angles
*1 right angle
Equalateral
*3 congruent sides
Obtuse
*1 obtuse angle
Triangle Sum Theorem: The sum of the measures of the three interior angles of
a triangle is 180 degrees.
Exterior Angle Theorem: The measure of an exterior angle of a triangle is equal
to the sum of the measure of the two remote interior angles.
Base angles of an Isosceles Triangle: The angles opposite the two congruent
sides of an isosceles triangle are called base angles.
Base angles of an isosceles triangle are congruent.
Scalene Triangle
Isosceles Triangle
Equilateral Triangle
Acute Triangle
Right Triangle
Obtuse Triangle
’s in a Triangle
Sides in a Triangle
Congruent Triangles
Similar Triangles
Area of a Triangle
Exterior
of a Triangle
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