Reference angles review.

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Which of the following degree measures is represented by this diagram?

Explain how you find the reference angle of an angle in standard position in 2-3 sentences.  Make sure to use the vocabulary words; Terminal side, acute angle, and x-axis

What is the reference angle for 645°?

• 85°

• 75°

• -85°

• -75°

What is the reference angle for 125°?

• 235°

• 125°

• 75°

• 55°

What is the reference angle for -30°?

• 150°

• 30°

• 80°

• 60°

Which of the following angles are co-terminal to -75^o?

• -365^o, 75^o

• 285^o, -435^o

• 105^o, -255^o

• 425^o, -335^o

Which of the following is a negative coterminal angle of 165 degrees?

• 195

• 525

• -525

• -195