1. The sides of the angles The vertex B C A Side ABSide AC

2. (1) Name of the angle <BAC or < CAB or <A (2) Vertex of the angle Remember that any angle have only one vertex And in this angle the vertex is A (3) Sides of the angle AB and AC And remember that the side all the time is ray

3. Types of Angle Acute angles 1 2 3 Acute angles are angles less than 90 o

4. Acute angles

5. Baby Acute Angle This is baby Acute angle. Isn’t he cute?! He loves a hug, He’s the smallest of the family, measuring less than 90°.

6. 90 o on a protractor Types of Angle Right angles A right angle is an angle of 90 o 1 2 3

7. Right angles

8. Mrs. Right Angle This is me. I’m Mrs. Right Angle. I always measure 90°, my favourite shape is a square, my husband tells you, I’m always right!

9. Types of Angle Obtuse angles 1 2 3 Obtuse angles are greater than 90 o but less 180 o

10. Obtuse angles

11. Mr. Obtuse Angle This is Obtuse. He’s the husband of the family. He’s bigger than Right and Acute., and he always measures between 90° and 180° (depending on how much dinner he’s eaten!)

12. Types of Angle Straight angles 180 o on a protractor A straight angle is an angle of 180 o

13. Straight angles

14. Acute Obtuse Acute Right Obtuse Acute Obtuse

15. Summery Acute angles Less than 90 ° Right angles All the time Equal 90 ° Obtuse angles Greater 90 ° and less than 180 ° Straight angles All the time equal 180 °