This document defines angles and their parts. An angle is formed when two straight lines meet at a vertex point, having two arms. Right angles measure 90 degrees and are formed by perpendicular lines. Acute angles are less than 90 degrees, while obtuse angles are greater than 90 degrees. The document also mentions using a set square to measure angles.

1. UNIT 2
ANGLES
by Maria Adrover
CEIP S'ALGAR. PORTOCOLOM
Geometry 3rd_Unit 2_Angles

2. DEFINITION
When two straight angles meet they form four angles

3. PARTS OF AN ANGLE
 An angle has got a vertex and two arms

4. RIGHT ANGLES
 When two perpendicular lines meet form four right angles
 A right angle is 90º

5. ACUTE AND OBTUSE ANGLES
 Smaller angles than 90º are called acute.
 Bigger angles than 90º are called obtuse.

6. Using the SET SQUARE

7. Using the SET SQUARE