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Date:____________
Group:___________
Name:_________________________________
Classifying Triangles
(Adapted from ShapeMakers, 1998; Geometry Activities for Middle School Students with the Geometer’s Sketchpad, 1998)
Determine whether each statement below is true always, sometimes, or never. Also, explain
your decision.
#
Statement
1.
An acute triangles is isosceles
2.
An obtuse triangle is scalene
3.
An obtuse triangle has a right angle
4.
An equilateral triangle is isosceles
5.
A triangle has two obtuse angles
6.
A right triangle has an obtuse angle
7.
An isosceles triangle has two acute
angles
8.
An isosceles triangle is equilateral
9.
An obtuse triangle has two acute angles
10.
A triangle has three acute angles
11.
An equilateral triangle has a right angle
12.
A right triangle has two acute angles
Always,
Sometimes,
or Never
Explanation