Workplace & Apprenticeship 10

Outcome 10.09Lesson #1

Angles and Lines

• Brainstorm some terminology related to angles and lines.

• Discuss the following images in terms of the angles and lines present.

Gable roof

Hip Roof

Pyramid Roof

Mansard roof

Salt Box roof

Flat Roof/ Shed Roof

Gambrel Roof

Common Angles

• Draw the following common angles. What methods/tools can be used to construct the angles?

22.5°30°45°60°90°

180°360°

Referents• Brainstorm referents for the common angles

22.5°30°45°60°90°

180°360°

• Use referents to identify angle measures found in common roof designs.

Lines and Angles

• Using a straight edge, draw 2 lines (not necessarily parallel) and a transversal to identify and remember– Supplementary angles – two angles that add up to 180°– Complementary angles – two angles that add up to 90°– Adjacent angles – two angles that share a common

vertex and a common arm– Vertically opposite angle - are the angles opposite each

other when two lines cross

Identifying Lines and Angles

• Identify examples of supplementary, complementary, adjacent and vertically opposite angles found in common roof designs.