2.8a^2=55
a^2=55/2.8
a= square root of 55/2.8
<h2>pi divided by four</h2>
Step-by-step explanation:
Let the angle in degrees be 
Let the angle in radians be 
If
is the angle in degrees and
is the angle in radians,

It is given that the 

So,
I think the answer is 240 tho im not completely sure
hope this helps
Then mark it down by less then 1%, of by whatever the number would be.