What is the value of y?

A. 50°

B. 30°

C. 60°

D. 400°

D. 40 degrees (I'm assuming you meant 40 not 400)

Step-by-step explanation:

There are 180 degrees in a triangle so we list the angles in an equation:

180 = 50 + 2y + y + 10

Subtract 60 from each side of the equation:

120 = 3y

Divide 3 from each side of the equation:

40 = y  

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step-by-step explanation:

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.