Lesson 7, Topic 1
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Types of Angles

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1) Acute Angle

 An acute angle is an angle, which is less than 90º.

ACUTE ang
Acute angle

\( \scriptsize \hat{ABC}\) is an acute angle because it is less than 90º.

Examples of acute angles are: 2º, 45º, 70º, 89º

2) Obtuse Angle 

 An obtuse angle is an angle, which is greater than 90º but less than 180º.

obtuse ang
Obtuse angle

\( \scriptsize \hat{ABC}\) is an obtuse angle because it is greater than 90º but less than 180º.

Examples of obtuse angles are: 92º, 102º, 140º, 168º. 

3) Reflex angle 

A reflex angle is an angle greater than 180º but less than 360º.

REFLEX ang
Reflex angle
Reflex angle
Reflex angle

\( \scriptsize \hat{ABC}\) is a reflex angle because it is greater than 180º.

But less than 360º

Examples of reflex angles are: 186º, 201º, 270º, 269º.

4) Right Angle

A right angle is an angle that is equal to 90º. (i.e. a quarter of a turn).

right-angle
Right angle

\( \scriptsize \hat{ABC}\) = 90º

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