Trigonometry Examples

$400$

Step 1

Find an angle that is positive, less than $360 °$ , and coterminal with $400 °$ .

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Step 1.1

Subtract $360 °$ from $400 °$ .

$400 ° - 360 °$

Step 1.2

The resulting angle of $40 °$ is positive, less than $360 °$ , and coterminal with $400 °$ .

$40 °$

Step 2

Since $40 °$ is in the first quadrant, the reference angle is $40 °$ .

$40 °$