Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 3)

What is a key characteristic of all right-angled triangles?
All sides are equal
One angle measures 90 degrees
All angles are acute
The sum of all the angles is 90 degrees

Explanation

A right-angled triangle has one angle which measures 90 degrees.

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