1. You have been asked to draw a sketch for a maze in an adventure theme park. Include each of these angles in your maze and construct the angles using your protractor:
a) 90° e) 170° i) 180°
b) 50° f) 140° j) 270°
c) 65° g) 10° k) 190°
2. Construct shapes with the following angles. a) Triangle: 55°, 60°, 65° c) Triangle: 27°, 115°, 38°
b) Square: 90° d) Triangle: 70°, 40°, 70°
3. Draw 5 reflex angles using your 180° protractor, pencil and ruler. Get the person beside you to measure the angles and write down their size.
The Sum of the Angles of a Triangle
4. Draw 4 different triangles. Measure their angles using a protractor and find their sum. When you add the 3 angles of each triangle, what do you get? A + B + C =
°
So we can say the sum of the angles of a triangle is 5. Calculate the missing angles.
? 40° ? 118° 45° ?
6. From what you know about the sum of the angles of a triangle, can you find the missing angles in these triangles?