Find the supplementary angle of $40 °$ .

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Solution

Supplementary Angles
Two angles whose sum is of $180 °$ are known as supplementary angles.
Let $x$ be the supplementary angle of $40 °$ .,
such that,
$\begin{array}{rcl} 40 ° + x & = & 180 ° \\ \Rightarrow & x = 180 ° - 40 ° \\ \Rightarrow & x = 140 ° \end{array}$
Hence, the supplementary angle of $40$ degree is $140 °$ .

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