Question

Could you check if my answer is correct please?!

The reference angle for an angle whose measure is -440° is _____.

10°
80° <-- i chose this!
100°

Answer 1

you're right!

Answer 2

@WinterRaine thank you! btw could you help me with this question also??

Write the following expression as a function of a positive acute angle. Use "+" to indicate a positive value and "-" to indicate a negative value.

sin312° = ____sin_____°

Answer 3

Sine is negative in the 4th quadrant (where 312 lies, so sin312 is neg), so you'll need a negative in front of the sine.

Use 360-312 to find the acute angle you need.