Acute, Right, Obtuse, and Straight Angles
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Grade 3 Math · Angles
Acute, Right, Obtuse, and Straight Angles
Angles worksheet for Grade 3: name six angles as acute, right, obtuse, or straight, turned every way. With an answer key.
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- Skill
- Angles Worksheets
- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
Reviewed by Ms. Olivia Parker, Teacher. How we check worksheets
How to use this sheet
- Have the child decide whether each angle is acute, right or obtuse before measuring it. The measurement should agree.
- Show how to line up the protractor: the small mark in the middle of the straight edge on the vertex, and the zero line on one arm.
- For missing angles, have the child write the equation, such as 90 − 35, before working it out.
Common mistakes
- Reading the wrong scale on the protractor, so a 40 degree angle is read as 140. Check: is the angle acute or obtuse?
- Thinking an angle with longer arms is bigger. Only the turn between the arms matters.
- Placing the corner or the edge of the protractor on the vertex, instead of the mark in the middle of its straight edge.
