Using Pythagoras' theorem to justify a right-angled triangle
Lesson 9 / 14
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Lesson outcome
I can use Pythagoras' theorem to justify whether a triangle is right-angled.
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For a triangle to be right-angled, Pythagoras' theorem must hold
By substituting in the three lengths, you can show whether the theorem holds
If the numbers produce a true statement, the triangle is right-angled
If they do not produce a true statement, the triangle is not right-angled
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