Construct a picture using straws or lollipop sticks. Name the angles used. An angle is a measure of rotation and is measured in degrees (°). A full rotation or full turn is 360 degrees, or 360°.


4. a) 1


– 4 of a full turn (or 1


– 4 of 360°) is a


right angle and measures °.


b) 1


– 2 of a full turn (or 1


– 2 of 360°) is a


straight angle and measures °.


You have just found that a right angle has 90°and a straight angle has 180°. You can now fill in the following.


5. a) An acute angle is °.


b) An obtuse angle is °.


c) A reflex angle is °.


than a right angle and measures between 0°and than a right angle and measures between 90°and than a straight angle and measures between 180° and


Demonstrate these rotations on your table using 2 pencils. To make an acute angle, place both pencils beside each other to start. Hold 1 still and move the other to make a right angle. An acute angle can measure from the pencil you are holding still to a right angle (90°).


6. Draw and label an example of each of these angles. a) right angle


d) straight angle


b) acute angle e) reflex angle


7. Name each of the angles you can spot in these signs. c) obtuse angle


38 Lines and Angles


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