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Classifying Triangles

Classifying Triangles by Angles and by Side Relationships
by

Leah Cogswell

on 8 November 2011

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Transcript of Classifying Triangles

Classifying Triangles
There are two ways to classify triangles:
By Angles and...
By Sides.
Angles
Acute Triangle
Obtuse Triangle
Right Triangle
Equiangular Triangle
A triangle with exactly 1 right angle
A triangle with exactly 1 obtuse angle
A triangle with 3 acute angles
A special acute triangle where all the angles are congruent
Sides
Scalene Triangle
Isosceles Triangle
Equilateral Triangle
A triangle where none of the sides are congruent
A triangle where exactly 2 sides are congruent
A triangle where all 3 sides are congruent
All Equiangular Triangles are Equilateral Triangles AND
All Equilateral Triangles are Equilangular.
To officially name a triangle, you need the side name first then the angle name:
Example:

This is a scalene right triangle
Now you try:
Obtuse Scalene Triangle
Acute Isosceles Triangles
Full transcript