To do the following activities, you will need a protractor like this one.


To measure an angle, place the centre point of the protractor on the point where the 2 lines meet.


Keeping the centre point on this point, twist the protractor until the 0° line is lined up along 1 of the lines making the angle.


Finally, read where the second line is pointing to on the protractor (in this case, 70, so the angle is 70°).


Constructing a Triangle 1.


a) Can you finish drawing this triangle? b) What is the length of the third side of this triangle? c) What do the other angles measure? d) Name this type of triangle.


b)


3cm 60° 3cm


2. Complete the construction of each of these triangles on a piece of paper. a)


c) 40° 4cm 4cm 3cm 75° 2cm


3. Measure and record the third side and the 2 missing angles on each of the triangles from question 2.


4. Construct a triangle with 1 line measuring 5cm and the 2 angles on this line measuring 100° and 35°. Measure the remaining sides and angle and complete the triangle.


2-D Shapes 1 69 4cm 60° 4cm


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