SOLUTION: 19 please help me with this one https://answers.yahoo.com/question/index?qid=20200224170718AAyKzII

Algebra ->  Circles -> SOLUTION: 19 please help me with this one https://answers.yahoo.com/question/index?qid=20200224170718AAyKzII      Log On


   

Question 1152929: 19
please help me with this one
https://answers.yahoo.com/question/index?qid=20200224170718AAyKzII
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The arc is twice the angle, so y is 70 degrees.
Tangent to a circle means perpendicular to the diameter, so a is 90 degrees.
Notice that the arc is 180 degrees or a semicircle.