25. Draw a triangle on a piece of paper using a ruler. Cut out the triangle and mark the 3 angles. Tear off the 3 angles and fit them together. What angle do they make when fitted together?


a


bc


26. Measure each of the above angles accurately with your protractor and add the 3 angles together.


a) angle a = b) angle b = d) angle a + angle b + angle c =


27. Cut out 2 more different types of triangle and investigate what the angles add up to. Now complete this sentence:


The 3 angles of a triangle add up to a angle or °.


28. Using your results from question 27, can you find the measurement of the missing angles in each of these triangles?


45° ? a) 90° ? ? d) 90° 40° e) 100° 20° f) 60° 60°


29. Make a set of instructions to take you from your seat in the classroom to the door, blackboard or teacher’s table. Include as many direction changes as possible.


30. Write a set of instructions for someone to walk in the shape of the following. a) square


b) rectangle c) triangle Lines and Angles ? b) 110° 30° c) 80° ? ? 50° c) angle c =


43


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