8.2 Perpendicular Lines

Focus: Use different methods to construct and identify perpendicular Line segments Materials: Ruler, triangle, protractor, compass, graph paper. Activity (with a partner) 1. Draw a line segment (7-8 cm long) on graph paper. 2 Using the tools provided(and your imagination), construct a second line segment perpendicular to the first. Complete 1 and 2 above in as many ways as you can. Try to find (at least) 3 different methods. Notes: 2 line segments are perpendicular if they intersect (meet) at a right angle(90 degrees) How can we construct Perpendicular Lines? 1. Use a plastic triangle. 2. Use paper folding. 3. Ruler and a protractor. 4. Use a mira. 5.Use a ruler and a compass. (see page 304) List Pairs of Lines which are Perpendicular:

Squares are also sets of perpendicular lines. Homework page 305....1 to 5