Find the measurement of unknown angles in the following figures.
Complement of $77 ° = d$ . Find $d .$

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Solution

Given complement of $77 ° = d$
Complementary angles are those angles that sum up to $90 ° .$
$\Rightarrow 77 ° + d = 90 ° \Rightarrow d = 90 ° - 77 °$
$∴ d = 13 °$
Hence the value of $d$ is $13 °$ .

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