Lesson on Triangles

Classifying Triangles

Volume 2: Pages 455-460

Triangles

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A triangle is a polygon with THREE sides and THREE angles.

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We name a triangle by the vertices of its angles.

Fill in the Blanks

What can we name the triangle?

Identify and label right, acute, and obtuse angles in the
triangles.

Different Types of Triangles

Fill in the Blanks

How many obtuse angles are in an obtuse triangle?

Multiple Choice

Which of the following is an acute triangle?

Multiple Choice

A right triangle has:

• one right angle and two acute angles

• three acute angles

• one obtuse angle and two acute angles

• two obtuse angles and one right angle

Fill in the Blanks

What king of triangle do we have?

Fill in the Blanks

What king of triangle do we have?

Fill in the Blanks

What king of triangle do we have?