In a right-angled triangle, the two non-right angles always form a pair of _______ angles.

vertically opposite

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adjacent

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complementary

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supplementary

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Solution

The correct option is C complementary
We know that the three angles of a triangle always add up to 180 degrees.
In a right-angled triangle, one of the angles is always a right angle. Therefore, the sum of other two angles must be 90 degrees so that the sum of all the three angles add up to 180 degrees.
Therefore, the two non-right angles form a pair of complementary angles.

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