3 1/2
2 1/4+ 1 1/4 = 3 2/4
or 3 1/2
Answer: 
Step-by-step explanation:
<h3>
The complete exercise is attached.</h3>
For this exercise it is important to remember that, by definition, if an angle formed by two intersecting chords has its vertex on a circle, this is called an "Inscribed angle".
The following formula is used to calculate the measure of an Inscribed angle:

You can identify in the figure that:

Then you can substitute values into the formula and solve for "x":

Then, AC is:

1) P=2w +2l
46=2w +14
32=2w
16= w or width
2) A=lw
A=7 x 12
A= 84
3) A= 12 x 21
A= 252