Unit 10 · Bearing and Scale Drawing
Bearing and Scale Drawing
Mathematics · Grade 7
What You Will Be Able To Do
🧭Measure and write a bearing correctly, with all three rules obeyed
↩️Work out a back bearing, and explain why the rule is add or subtract 180
📏Convert between a drawing length and a real distance in either direction
🗺️Draw an accurate scale map of a journey, or of your own school grounds
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A bearing is just an angle, but three rules are attached to it so that everybody in the world reads it the same way. From north. Clockwise. Three figures.
Presenter notes: Open with a problem that words cannot solve. Ask a student to describe, without pointing, the direction of a landmark outside the window, and they will say something like over there past the tree. Ask another student to face that direction from a different part of the room and they will get it wrong. Then ask how a pilot tells another pilot which way to fly. The answer has to be a number that means the same thing everywhere, and that is a bearing.