8. Draw examples of each of the following. a) parallel lines d) right angle
g) horizontal line j)
straight angle
9. Estimate the size of each of these angles and then check your estimate by measuring them using your protractor.
b) acute angle
e) perpendicular lines h) refl ex angle
c) oblique line f) obtuse angle i) vertical line
10. Draw these angles using a pencil, ruler and protractor. a) 60°
b) 140° c) 35°
d) 125°
When drawing angles, remember: Draw one line of the angle with a ruler. Place the baseline of the protractor on this line, with the centre point on the end of the line.
Follow the scale to the angle you want and mark this point. Join this point to the end of your line.
11. Estimate the answers before multiplying. Check your answers with a calculator.