I hope this makes sense, if not please feel free to let me know and I'll explain it.
The answer is a. here’s a picture that hopefully helps explain the reasoning/work
Answer:
25
Step-by-step explanation:
25 25
Angle in a semi circle is 90°
<a = 180-90-<b = 90-28 = 62°
opposite angles of a cyclic quadrilateral sums up to 180°
<b + <a = 180
<b = 180-62
<b = 118°
Answer:
The biggest - the smallest
612-120=492