Question

how to prove measurement of OBC=thita - 90°​

Answer 1

Answer:

solution given below

Step-by-step explanation:

y + y + t = 180. 2y + 360 - 2x = 180. 2y - 2x = 180 - 360 = (-180) Or,

2x - 2y = 180.

2(x-y) = 180. x - y = 180 /2 = 90. So, Angle BAC - Angle OBC = 90 degrees. Hence, Proved! Thanks!

Answer 2

Answer:

angle OBC + angle BAC = 90 degrees? From the original ABC: m BAC + m ABC + m BCA = 180. Since O is the center of the circumscribed circle OA = OB = OC (all radii of a circle are congruent).