IGCSE Maths / Pythagoras theorem
Pythagoras on a coordinate grid revision notes
Edexcel International GCSE Maths (4MA1), chapter 15: Pythagoras theorem, specification point 4.8a-f. Part of the full course.
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Find the straight-line distance between two points by using their horizontal and vertical gaps as the shorter sides of a right-angled triangle. Then apply Pythagoras’ theorem to find the sloping distance.