Answer:
Option (B) is correct.
To prove
As given the epression in the question is given by

Now simplify the above
Terms are written as


Put in the above expression.




What the maning of that ?
22.5 i Hope I’m right
Sorry if this is wrong
Area = (theta/360)* pi * r^2
where theta is the angle of the sector
subs by your givens in the above equation
2.512 = (theta/360) * pi * (4)^2
theta = (2.512 * 360) /(pi*(4)^2)
theta = 18 degree