If two angles of a triangle are complementary, then the third angle is ………………..

$36 °$

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$45 °$

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$60 °$

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$90 °$

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Solution

The correct option is D
$90 °$

If the sum of two angles is $90 °$ , then those angles are known as complementary angles.
Since, the sum of all the angles of a triangle is $180 °$ ,
therefore the third angle $= 180 ° - 90 °$
$= 90 °$
Hence, the third angle is equal to $90 °$ .

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