What is the sin 250 degree when expressed as a positive acut

What is the sin 250 degree when expressed as a positive acute angle? A) sin 70 degree B) sin 20 degree C) -sin 70 degree D) -sin 20 degree

Solution

The coterminal angle of 250 degrees is, 250 - 180 = 70 degrees.

Also, 250 degrees is preset in 3^rd quadrant where Sin is negative.

So sin 250 = - sin 70

So option C is correct.