Types of Angles: Right, Acute, and Obtuse

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The document defines and provides examples of right, acute, and obtuse angles. Right angles measure 90 degrees. Acute angles are less than 90 degrees, while obtuse angles are greater than 90 degrees but less than 180 degrees. Multiple drawings of angles are provided and identified as being either right, acute, or obtuse.

Right-Angle

A right-angle is 90°.

These are examples of right-angles:
Two lines that meet
at a right angle are
perpendicular.

90°
90°

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Acute-Angles
An acute angle is
less than 90°.

These are examples of acute angles:

20°
40° 75°

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Obtuse-Angles
An obtuse angle is
greater than 90° and
less than 180°.
These are examples of obtuse angles:

170°
110°

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

Right angle, acute or obtuse?
What kind of angle is this?

© Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

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Types of Angles: Right, Acute, and Obtuse

1. Right-Angle A right-angle is 90°. These are examples of right-angles: Two lines that meet at a right angle are perpendicular. 90° 90° © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

2. Acute-Angles An acute angle is less than 90°. These are examples of acute angles: 20° 40° 75° © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

3. Obtuse-Angles An obtuse angle is greater than 90° and less than 180°. These are examples of obtuse angles: 170° 110° © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

4. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

5. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

6. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

7. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

8. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

9. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)

10. Right angle, acute or obtuse? What kind of angle is this? © Copyright 2008, SparkleBox Teacher Resources (www.sparklebox.co.uk)