Measuring Angles with a Protractor

How to use a Protractor

Types of Angles

Acute Angle diagramAcute angleLess than 90°
Right Angle diagramRight angleEqual to 90°
Obtuse Angle diagramObtuse angleBetween 90° and 180°
Straight Angle diagramStraight angleEqual to 180°
Reflex Angle diagramReflex angleBetween 180° and 360°

Compass Bearing

Compass diagram

Cardinal Points - Directions in words e.g. north, south, east, west, north-east, south-east

Compass Bearings - Directions in numbers of degrees that are measured clockwise from north as follows:

Question - Orienteering

Orienteering Compass

Orienteering is a sport that uses navigational skills of reading maps and compasses while running through mountains and valleys. If I leave home and I travel the following legs of my journey, how far and at what bearing from home will I be? (In your sketch, use a scale of 1 cm for each 1 km.)

I'm home

Did You Know That...?


Mandalas are complex geometric designs for quiet contemplation in the Buddhist and Hindu religions.