Right, Acute & Obtuse Angles
Basics on the topic Right, Acute & Obtuse Angles
How do we know whether an angle is acute, right, obtuse or reflex? Learn here about the different types of angles.
Right, Acute & Obtuse Angles exercise

Identify the types of angles.
HintsA right angle is the most common angle and forms a perfect square at the corner of the arc.
A complete circle is 360°.
An acute angle is less than 90°.
An obtuse angle is more than 90° and less than 180°.
Solution A straight angle or line is 180°.
 A reflex angle is more than 180° but less than 360°.
 A right angle is 90°.
 A complete angle is 360°, or a full circle.

Define the terms.
HintsMost angles have arcs.
Remember, an angle less than a right angle is an acute angle.
A vertex is where two or more lines meet.
Solution Obtuse angles have a large arc, more than 90° and less than 180°.
 Acute angles have a small arc less than 90°.
 The vertex is the point where two rays meet to form an angle.
 Right angles measure exactly 90°.

Sort different angles.
HintsAn acute angle is less than 90°.
An obtuse angle is more than 90° and less than 180°.
Two choicies are acute angles, two choices are obtuse angles and one choice is a right angle.
SolutionOBTUSE ANGLES are more than 90° and less than 180°
 120°
 150°
 60°
 45°

Identify the types of angles.
HintsA complete circle is 360°.
An acute angle is less than 90°.
A reflex angle is more than 180° but less than 360°.
A straight angle is also known as a line.
SolutionREFLEX ANGLES are more than 180° and less than 360°
 215°
 197°
 45°
A COMPLETE ANGLE is 360°, or a full circle 
Label the angle.
HintsAn acute angle has a small arc of less than 90°.
An obtuse angle has a large arc of more than than 90° and less than 180°.
A complete angle is 360°
SolutionA right angle is the most common angle and forms a perfect square at the corner of the arc. Its arc is 90°

Name and define the angles.
HintsThis is an obtuse angle because it is greater than 90° and less than 180°.
A straight angle is also known as a line.
A complete circle is 360°.
Solution A right angle is 90°
 An acute angle is less than 90°
 An obtuse angle is greater than 90° and less than 180°
 A straight angle is 180°
 A reflex angle is greater than 180° and less than 360°
 A complete angle is 360°
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