Which of the following angles is the complement of 30 $°$ ?

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150

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Solution

The correct option is B 60 $°$
Two angles are said to be complementary if their sum is $90$ $°$ .
Let another angle be $x$ .
So,
$x ° + 30 ° = 90 ° \Rightarrow x ° = 90 ° - 30 ° = 60 °$

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