Download Classify triangles by examining their properties, Practice Set C

Classify triangles by examining their properties, Practice Set C
Name:
Date:
1. Draw straight lines from one vertex of the pentagon to the opposite vertex.
a. What new shapes did you make?
b. How are the new shapes the same?
c. How are the new shapes different?
2. Can you make a triangle with two right angles? Make a model and justify your
thinking.
Classify triangles by examining their properties, Practice Set C
Answer Key
1. Draw straight lines from one vertex of the pentagon to the opposite vertex.
Students are allowed to choose any vertex to show their work. Here’s an
example.
a. What new shapes did you make?
I made three triangles.
b. How are the new shapes the same?
The new shapes are all triangles, two dimensional closed shapes with three
sides and three angles. These triangles don’t have a right angle.
c. How are the new shapes different?
The new shapes have different side lengths and different angles. The
middle triangle has three angles less than a right angle. The other two
triangles have one angle greater than a right angle.
2. Can you make a triangle with two right angles? Make a model. Explain your
thinking.
Students are allowed to choose the model’s orientation. Here’s an example.
A triangle cannot have two right angles because a triangle only has three
sides. If the shape has two right angles it would be open. If you try to close
the shape you would be adding another side and it wouldn’t be called a
triangle.