G 22 Angles and bearings This icon indicates

G 22 Angles and bearings This icon indicates the slide contains activities created in Flash. These activities are not editable. For more detailed instructions, see the Getting Started presentation. 1 of 17 © Boardworks Ltd 2009

G 22. 1 Measuring angles 2 of 17 © Boardworks Ltd 2009

Measuring angles An angle is a measure of turn and is usually measured in degrees. 360° 3 of 17 25 A full turn measures 360°. © Boardworks Ltd 2009

Measuring angles An angle is a measure of turn and is usually measured in degrees. A quarter turn measures 90°. It is called a right angle. 90° 4 of 17 25 We label a right angle with a small square. © Boardworks Ltd 2009

Measuring angles An angle is a measure of turn and is usually measured in degrees. 180° A half turn measures 180°. This is a straight line. 5 of 17 25 © Boardworks Ltd 2009

Measuring angles An angle is a measure of turn and is usually measured in degrees. 270° 6 of 17 25 A three-quarter turn measures 270°. © Boardworks Ltd 2009

Acute, obtuse and reflex angles All angles are acute, obtuse or reflex. An acute angle is between 0º and 90º. 7 of 17 25 An obtuse angle is between 90º and 180º. An reflex angle is between 180º and 360º. © Boardworks Ltd 2009

Acute, obtuse and reflex angles Look at each interior angle in this shape. Is it acute, obtuse or reflex? B D C A I F E H G 8 of 17 25 © Boardworks Ltd 2009