Represent angle (-x) in terms of x

Represent angle( 90-x) in terms of x

Represent angle (90+x) in terms of x

Represent angle (270-x) in terms of x

Represent angle (180-x) in terms of x

Represent angle (180+x) in terms of x

Represent angle (270+x) in terms of x

Represents angle (360-x) in terms of x

Points P, Q, and R lie on the circumference of the circle centered at O. If angle OPQ measures x^(@) and angle QRO measures y^(@) , what is the measure of angle POR in terms of x and y ?

If A, x and y are all distinct numbers , and A =(xy-2)/(x-y) which of the following represents x , in terms of A and y ?