Given: dr tangent to circle o.

ir db=140, then a=

a)70
b)110
c)140
d)80

the quiz says 140 is wrong, but i don’t know if that’s a problem on the teacher’s end or not, because everyone here says it’s 140

Step-by-step explanation:

In this problem we need to use the Inscribed Angle theorem, which states that an inscribed angle is one-half its subtended arc.

Then, we use the theorem about a cyclic quadrilateral, which is an inscribed quadrilateral: "the opposite angles in a cyclic quadrilateral are supplementary".

Therefore, the answer is 110°

It is B and C.

Step-by-step explanation:

Hope this helped have an amazing day!