Practice recognizing acute, right, and obtuse angles and classifying triangles by their sides and angles.
Read each problem carefully. Use what you know about angles and triangles to answer each question. Show your work when needed.
Classifying angles and identifying triangle types
Math - Grade 4-5
- 1
An angle measures 35 degrees. Is it acute, right, or obtuse?
- 2
An angle measures 90 degrees. Is it acute, right, or obtuse?
- 3
An angle measures 120 degrees. Is it acute, right, or obtuse?
- 4
Draw one acute angle and label it with a measure that makes sense.
- 5
Draw one right angle and label it with its measure.
- 6
Draw one obtuse angle and label it with a measure that makes sense.
- 7
A triangle has 3 equal sides. What kind of triangle is it by its sides?
- 8
A triangle has 2 equal sides and 1 side that is a different length. What kind of triangle is it by its sides?
- 9
A triangle has 3 sides of different lengths. What kind of triangle is it by its sides?
- 10
A triangle has one right angle. What kind of triangle is it by its angles?
- 11
A triangle has three acute angles. What kind of triangle is it by its angles?
- 12
A triangle has one obtuse angle. What kind of triangle is it by its angles?
- 13
Can a triangle have two right angles? Explain why or why not.
- 14
Can a triangle have two obtuse angles? Explain why or why not.
- 15
A triangle has side lengths 5 cm, 5 cm, and 8 cm. Classify the triangle by its sides.