Classifying Triangles by Angles

Triangles

Vocabulary Words:
Equilateral triangle
Isosceles triangle
Scalene triangle

Right triangle
Acute triangle
Obtuse triangle

Classify

Congruent

how you sorted them.

LOREMLOREM

A an acute angle is
less than 90 degrees

An obtuse angle is
greater than 90
degrees

A right angle is exactly
90 degrees

Classify the triangle by its sides then its angles

32°

25°

22°

22°

22°

Classify the triangle by its sides then its angles

Classify the triangle by its sides then its angles

Classify the triangle by its sides then its angles

35°

45°

Classify the triangle by its sides then its angles

​

​106°

87°

87°

Classify the triangle by its sides then its angles

35°

45°

A triangle has angles that measure 45°, 98°, and 54°. What kind of triangle is this?

A triangle has angles that measure 81°, 57°, and 73°. What type of triangle is this?

A triangle has angles that measure 93°, 64°, and 23°. What type of triangle is this?

A triangle has angles that measure 90°, 54°, and 13°. What type of triangle is this?

​What kind of triangle has perpendicular sides?

A. Acute triangle
B. Obtuse triangle
C. Right triangle

Which triangle appears to be an
acute triangle?

You made a triangle that had one 90°
angle and two acute angles. Which term
describes your triangle?

Multiple Choice

If a triangle has at least one angle that is exactly 90°, what kind of triangle is it?

• Acute triangle

• Obtuse triangle

• Right triangle

Multiple Choice

If a triangle has all angles that are less than 90°, what kind of triangle is it?

• Acute triangle

• Obtuse triangle

• Right triangle

Multiple Choice

If a triangle has at least one angle that measures greater than 90°, what kind of triangle is it?

• Acute triangle

• Obtuse triangle

• Right triangle