Understanding Angles and Trigonometric Functions

The video tutorial explains how to determine the reference angle and quadrant for an angle of 225 degrees. It involves sketching the angle in standard position, calculating the reference angle, and identifying the quadrant. The tutorial also covers finding the exact values of sine, cosine, and tangent using a reference triangle and verifying these values with the unit circle.

What is the reference angle for 225 degrees?

• 45 degrees

• 60 degrees

• 90 degrees

• 30 degrees

In which quadrant does the terminal side of a 225-degree angle lie?

• Quadrant III

• Quadrant II

• Quadrant I

• Quadrant IV

What is the sine of 225 degrees using a reference triangle?

• √2/2

• 1/2

• -1/2

• -√2/2

What is the cosine of 225 degrees using a reference triangle?

• 1/2

• -1/2

• -√2/2

• √2/2

What is the tangent of 225 degrees using a reference triangle?

• √3

• 1

• 0

• -1

How do you rationalize the denominator of -1/√2?

• Multiply by 2/2

• Multiply by -1

• Multiply by √3/√3

• Multiply by √2/√2

What is the sine of 225 degrees using the unit circle?

• √2/2

• -√2/2

• -1/2

• 1/2

What is the cosine of 225 degrees using the unit circle?

• -1/2

• √2/2

• -√2/2

• 1/2

What is the tangent of 225 degrees using the unit circle?

• √3

• -1

• 1

• 0

What is the relationship between the reference triangle and the unit circle for trigonometric values?

• The reference triangle is more accurate

• They give different results

• They give the same results

• The unit circle is more accurate