Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 9)
What is the relationship between the angles in a right-angled triangle?
All angles are equal.
The sum of the two non-right angles is 90 degrees.
The right angle is always the smallest angle.
The sum of all three angles is 180 degrees, and one angle is 45 degrees.
Explanation
The two acute angles in a right-angled triangle are complementary (add up to 90 degrees).
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