Classifying Triangles (Except) Worksheet Download
Three of the four terms really do fit the triangle, so a term has to be ruled out rather than recognized - a triangle with two congruent angles can be right (45-45-90), isosceles, equilateral, acute or obtuse, but never scalene. No problem is ever built where the answer turns on whether an equilateral triangle counts as isosceles: that depends on which definition a textbook uses, so isosceles is never offered against a statement forcing all three sides equal and never made the answer to one that allows an equilateral triangle.
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Classifying Triangles (Except)
A fact about a triangle is given and students choose the one term of four that could NOT describe it.
About this worksheet
A fact about a triangle is given and students choose the one term of four that could NOT describe it.
Student objectives
- Rule out a term that cannot describe a triangle
- Know that two congruent angles mean two congruent sides
- Recognize that a right or obtuse triangle can still be isosceles
- Classify triangles by both their sides and their angles
Everyday practice
- Decide what shapes a roof truss could be from one measurement
- Say which descriptions of a sign are impossible
- Rule out an answer instead of finding one
- Sort triangles by side length and by angle at the same time