Arc Length, and Area of a sector
Hi i need soem help on doign a problem please! I actually asked this problem to the teacher and showed him my work if this was how to do the problem and he said yes its all correct so i input it in the computer at home and it said the answer was wrong! here is the problem.
An arc of length 3 feet is cut off by a central angle of π/2 radians. Find the area of the sector formed. (Round the answer to two decimal places.)
answer goes

V
______ ft^2
So what i did was. since they gave me s=3 and r=pi/2 i did 3/(pi/2), and i get 1.909859317. and then this gives me theta. so then i put it in the 1/2(r)^2(theta) and get 2.35619449 then round that to 2.36 and it says im wrong o_0 help please! thxs!