Angles & Right Angle Comparison
Match Angle Names
Draw a line from each angle type to its description.
Sort the Angles (Set A)
Sort each angle into the correct column.
Sort the Angles (Set B)
Sort each angle.
Name That Angle (Set A)
Circle the correct name for each angle.
An angle of 60°
An angle of 135°
A corner of a book
An angle of 89°
An angle of 91°
Name That Angle (Set B)
Circle the correct name.
An angle of 10°
An angle of 90°
An angle of 175°
An angle of 45°
An angle of 120°
Angles in Real Life (Set A)
Think about each object. Circle the type of angle it makes.
The corner of a window
Clock hands at 10 o'clock
Clock hands at 3 o'clock
A slightly open laptop
Angles in Real Life (Set B)
Circle the type of angle.
Clock hands at 6 o'clock
A pizza slice tip
Corner of a square tile
An open pair of scissors
Bigger or Smaller Than a Right Angle? (Set A)
Circle the correct answer.
50° compared to 90°
110° compared to 90°
90° compared to 90°
25° compared to 90°
Bigger or Smaller Than a Right Angle? (Set B)
Circle the correct answer.
145° compared to 90°
88° compared to 90°
90° compared to 90°
5° compared to 90°
Match Angles to Descriptions
Draw a line to match.
Match Angles to Everyday Objects
Draw a line from each angle type to an object that shows it.
Angles That Make 90°
Two angles add to a right angle (90°). Find the missing angle.
Angles That Make 180°
Two angles on a straight line add to 180°. Find the missing angle.
Angle Sequences
Fill in the missing angles. Each step adds the same amount.
How Many Right Angles in the Shape?
Circle the correct number of right angles.
Rectangle
Square
Equilateral triangle
Right-angled triangle
Classify Angles (Write the Type)
Write whether each angle is acute, right, obtuse, or straight.
35° is a(n) ___ angle
90° is a(n) ___ angle
155° is a(n) ___ angle
180° is a(n) ___ angle
72° is a(n) ___ angle
108° is a(n) ___ angle
Sort: Less, Equal, or Greater Than 90°
Sort each angle.
Count the Right Angles
Count how many right angles are shown. Write the number.
Count the Right Angles (Set B)
Count the right angles in each shape.
Angle Type? (Set C)
Circle whether the angle is acute, right, or obtuse.
30°
90°
150°
85°
Angle Type? (Set D)
Circle the angle type.
5°
179°
45°
91°
True or False? (Angles – Set B)
Circle TRUE or FALSE.
An acute angle is less than 90°
An obtuse angle is less than 90°
A right angle is exactly 90°
A straight line makes an angle of 180°
True or False? (Angles – Set C)
Circle TRUE or FALSE.
A square has 4 right angles
All triangles have a right angle
A circle has no angles
An equilateral triangle has 3 equal angles of 60°
Match Angles to Types (Set A)
Draw a line from each angle to its type.
Match Angles to Types (Set B)
Draw a line to match.
Sort: Acute, Right, or Obtuse? (Set C)
Sort each angle.
Sort: Acute, Right, or Obtuse? (Set D)
Sort each angle.
Angles Adding to 90° (Complementary)
Two angles add up to 90°. Find the missing angle.
Angles Adding to 180° (Supplementary)
Two angles on a straight line add up to 180°. Find the missing angle.
Identify Angles in Shapes
Name the type of angle at each corner.
A square has ___ angles at each corner (acute/right/obtuse).
An equilateral triangle has ___ angles at each corner.
A regular hexagon has ___ angles at each corner.
Name a shape that has both acute and obtuse angles:
Angles in Everyday Life
Identify angles in the real world.
Name 3 things with right angles:
Name 2 things with acute angles:
Name 2 things with obtuse angles:
Angle Sequences
Continue the pattern of angles.
Compare Angles (Set A)
Circle the larger angle.
Which is larger?
Which is larger?
Which is larger?
Which is larger?
Compare Angles (Set B)
Circle the larger angle.
Which is larger?
Which is closer to a right angle?
Which is larger?
Which is larger?
Angles in Our Classroom
Count objects with each type of angle.
| Right angles | |
| Acute angles | |
| Obtuse angles |
Which type of angle is most common in the classroom?
How many angles were found altogether?
Can you think of where the obtuse angles might be?
Estimate the Angle (Set A)
Circle the best estimate for each angle.
A slightly open door
A door open halfway
A door wide open
Estimate the Angle (Set B)
Circle the best estimate.
Corner of an equilateral triangle
Corner of a square
Corner of a regular hexagon
Draw and Label Angles (Set A)
Draw an example of each type of angle. Label it.
Draw an acute angle:
Draw a right angle:
Draw an obtuse angle:
Draw and Label Angles (Set B)
Draw angles of approximately the given size.
Draw an angle of about 45°:
Draw an angle of about 120°:
Draw a straight angle (180°):
Angles in Shapes
Answer each question about angles in shapes.
How many right angles does a rectangle have?
Name a shape that has only acute angles.
Can a triangle have an obtuse angle? If yes, draw one.
Can a triangle have two right angles? Explain why or why not.
Angles in a Turn
Circle the correct answer.
A quarter turn = ?
A half turn = ?
A full turn = ?
A three-quarter turn = ?
Match Turns to Degrees
Draw a line to match.
Angle Reasoning
Answer these questions about angles.
The angles in a triangle add up to 180°. If two angles are 60° and 70°, what is the third?
A right angle is 90°. Two right angles together make ___°.
If you turn 90° clockwise three times, how many degrees have you turned in total?
Challenge: Angle Puzzles
Solve these puzzles.
An angle is 30° less than a right angle. What is the angle?
Two equal angles together make a straight angle (180°). What is each angle?
Clock hands at 1 o'clock form a 30° angle. What angle do they form at 4 o'clock?
Home Activity: Angle Hunt
Find angles around your home!
- 1Find 3 right angles in your home (hint: corners of doors, books, tables).
- 2Open a door slightly — is the angle acute or obtuse? Open it wider — what now?
- 3Look at clock hands at different times. List which make acute, right and obtuse angles.
- 4Make angles with your arms. Can a friend guess if it is acute, right or obtuse?
Match Angle Type to Description
Draw a line from each angle type to its description.
Identify the Angle Type (Set A)
Circle the type of angle for each measurement.
A 45° angle is:
A 120° angle is:
A 90° angle is:
A 175° angle is:
Angles in Polygons
Find the sum of angles in each polygon.
The angles in a triangle add to ___°. In an equilateral triangle, each angle = ___°
The angles in a rectangle add to ___°. Each angle = ___°
A regular pentagon has 5 equal angles. Total = 540°. Each angle = ___°
Sort Angles: Acute, Right, Obtuse or Reflex?
Sort each angle into the correct column.
Measuring Angles
Estimate the angle shown, then explain how to check with a protractor.
A clock shows 3 o'clock. The angle between the hands is ___°.
A clock shows 6 o'clock. The angle is ___°. This type of angle is called ___.
A clock shows 9 o'clock. The angle is ___°. This type is ___.
Angles on a Straight Line
Angles on a straight line add to 180°. Find the missing angle.
One angle is 70°. The other angle = ___°
One angle is 135°. The other angle = ___°
Three angles on a line: 45°, 90°, ___°
Two equal angles on a line. Each angle = ___°
Angles at a Point
Angles at a point add to 360°. Find the missing angle.
Three angles at a point: 90°, 120°, ___°
Two angles at a point: 215°, ___°
Four equal angles at a point. Each angle = ___°
Angles in Triangles
Circle the correct answer.
A triangle has angles of 60° and 80°. The third angle is:
A right triangle has one angle of 90° and another of 35°. The third is:
Can a triangle have two obtuse angles?
An equilateral triangle has all angles equal. Each angle is:
Trace and Label Angle Types
Trace each shape and label all angles as acute, right or obtuse.
Angles Found in the Classroom
Tally how many of each angle type you can find in the classroom.
| Item | Tally | Total |
|---|---|---|
Acute angles | ||
Right angles | ||
Obtuse angles | ||
Straight angles |
Compass Directions and Angles
Use compass directions to think about angles.
Turning from North to East is a ___° turn (clockwise).
Turning from North to South is a ___° turn.
Turning from East to West clockwise is ___°. Anti-clockwise is ___°.
What direction are you facing after turning 270° clockwise from North?
Angles in Real Life
Find and describe angles in real life.
Name three objects in your home that have right angles.
Name three objects that have acute angles.
Why do builders need to know about right angles? Give two reasons.
Challenge: Angle Puzzles
Solve these angle puzzles.
I am an angle in a regular hexagon. All 6 angles are equal and add to 720°. I am ___°.
Two angles are supplementary (add to 180°). One is three times the other. Find both angles.
An angle and its complement add to 90°. One angle is 25°. What is the complement?