Pls help, with explanation :) I will give brainliest

C,110°

Step-by-step explanation:

when the angle on circumference=50°

then the angle at center=2×50=100°

other angles of this triangle are equal and each=1/2(180-100)=1/2×80=40

so angle of quadrilateral=30+40=70°

as opposite angles of a cyclic quadrilateral are supplementary.

so y+70=180

y=180-70=110°

search the worksheet up on the internet

step-by-step explanation:

it works trust me

probably .5

i can on others if necessary.