461 because you take 506-45 to find x(the unknown number)
Umm i think the answer is C
Answer: I got 3.
Step-by-step explanation:
The circumference of a circle is

and it coresponds to a 360 degree angle.
The circumference of the circle is 2*4*pi=8pi m=25.12m
25.12m......360 degrees
10 m.........x degrees
x=10*360/25.12=143.31 degrees