 # Triangle Classification. Objectives Classify triangles by their angle and side measures Find the sum of the measure of the interior and exterior angles.

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Triangle Classification

Objectives Classify triangles by their angle and side measures Find the sum of the measure of the interior and exterior angles of a triangle

Not EQUILATERAL EQUILATERAL So What is an Equilateral? Three equal sides

Not Isosceles! Isosceles Isosceles ! So What is an Isosceles? Two or more congruent (equal) sides

Not SCALENE SCALENE What is a SCALENE? No equal sides

Triangle classification based on length of sides Equilateral Triangle Three equal sides Isosceles Triangle Two or more congruent (equal) sides Scalene Triangle No equal sides

ACUTE SO WHAT IS AN “ACUTE” TRIANGLE? Each angle is acute / all angles measure less than 90°

Not OBTUSE OBTUSE What is an OBTUSE Triangle? One angle is obtuse. It has an angle greater than 90°

Not RIGHT RIGHT So what is a RIGHT triangle? One angle is a right angle. One angle is exactly 90°

Triangle classification based on angles Acute Triangle Each angle is acute. All angles less than 90° Obtuse Triangle One angle is obtuse. It has an angle greater than 90° Right Triangle One angle is a right angle. One angle is exactly 90°

Triangle classification based on angles (continuation) Equiangular (also equilateral) All angles are the same. Always is an equilateral triangle

What type of triangle is this? By length: A. Equilateral B. Isosceles C. Scalene By angle: D. Acute E. Obtuse F. Right G. Equiangular

What type of triangle is this? By length: A. Equilateral B. Isosceles C. Scalene By angle: D. Acute E. Obtuse F. Right G. Equiangular

It’s OK Bob. She wasn’t acute one.

What type of triangle is this? By length: A. Equilateral B. Isosceles C. Scalene By angle: D. Acute E. Obtuse F. Right Equiangular

What type of triangle is this? By length: A. Equilateral B. Isosceles C. Scalene By angle: D. Acute E. Obtuse F. Right G. Equiangular

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