Angles Worksheets
Page one has eight angles to classify and three to draw. Page two has six angles to measure with a protractor (in 5-degree steps) and four split angles where students find the missing part.
The angles print at their true measure, so a protractor gives the exact answer. Press “New worksheet” for a new set.
Acute, Right and Obtuse Angles
An acute angle is less than a right angle. A right angle is a square corner (90°). An obtuse angle is more than a right angle but less than a straight line. Circle the name of each angle.
Draw each angle.
Measure Angles with a Protractor
Use a protractor to measure each angle. Write the measure in degrees. Then write acute, right or obtuse.
The whole angle is split into two parts. Find the missing angle measure.
Acute, Right and Obtuse Angles: Answer Key
An acute angle is less than a right angle. A right angle is a square corner (90°). An obtuse angle is more than a right angle but less than a straight line. Circle the name of each angle.
Draw each angle.
Measure Angles with a Protractor: Answer Key
Use a protractor to measure each angle. Write the measure in degrees. Then write acute, right or obtuse.
The whole angle is split into two parts. Find the missing angle measure.
Teaching tips
- Common Core 4.G.A.1 asks students to draw and identify right, acute and obtuse angles. 4.MD.C.6 covers measuring angles in whole-number degrees with a protractor, and 4.MD.C.7 covers angle measure as additive and finding unknown angles.
- Compare with the corner of an index card: smaller than the corner is acute, bigger is obtuse.
- Line up the protractor’s center on the vertex and its zero line on one ray before reading the scale.
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