Summary Angles.docx

Topic/Skill Definition/Tips
Topic: Angles Example
1. Types of Acute angles are less than 90°.
Angles Right angles are exactly 90°.
Obtuse angles are greater than 90° but less
than 180°.
Reflex angles are greater than 180° but less
than 360°.
2. Angle Can use one lower-case letters, eg. θ or x
Notation
Can use three upper-case letters, eg. BAC



3. Angles at a Angles around a point add up to 360°.
Point




4. Angles on a Angles around a point on a straight line
Straight Line add up to 180°.




5. Opposite Vertically opposite angles are equal.
Angles

6. Alternate Alternate angles are equal.
Angles They look like Z angles, but never say this
in the exam.


7. Corresponding angles are equal.
Corresponding They look like F angles, but never say this
Angles in the exam.




8. Co-Interior Co-Interior angles add up to 180°.
Angles They look like C angles, but never say this
in the exam.




Mr A. Coleman Glyn School