The measure of angle O is 7pi/4. The measure of its reference angle is _degree, and tan O is _?

The measure of angle θ = 7pi/6. To convert this to degrees, substitute pi with 180 degrees. Pi is always equal to 180 degrees.

0 become:7 x 180/6

Therefore, 0 = 210 degrees.

And, to solve for sin 0, you can directly input sin (210) in the calculator.

Thus, sin 0 = sin (210) = - 0.5 or - 1/2

I belive

Identities that come from sums, differences, multiples, and fractions of angles