Trigonometry Examples

Find the Quadrant of the Angle -1.5
Step 1
Convert the radian measure to degrees.
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Step 1.1
To convert radians to degrees, multiply by , since a full circle is or radians.
Step 1.2
Multiply .
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Step 1.2.1
Combine and .
Step 1.2.2
Multiply by .
Step 1.3
Move the negative in front of the fraction.
Step 1.4
Replace with an approximation.
Step 1.5
Divide by .
Step 1.6
Multiply by .
Step 1.7
Convert to a decimal.
Step 2
For angles smaller than , add to the angle until the angle is larger than .
Step 3
The angle is in the fourth quadrant.
Quadrant
Step 4