Perpendicular linear graphs
Lesson 9 / 13
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I can prove the relationship between the gradients of perpendicular lines.
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Two lines are perpendicular if they meet at right angles.
The product of the gradients of two perpendicular lines is -1
This can be derived from Pythagoras' theorem.
The product of the gradients of two lines is -1 iff the lines are perpendicular.
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