Http://prntscr.com/enb5tw you will find the answer there
You need to split up the irregular shape into shapes that you are familiar with them find the area of each piece and add it together. i’m not sure if that made sense.
Well, if you look at the picture, the "radius" is 1/4, so r = 1/4.

Answer:
158 quarters
54 dimes
Step-by-step explanation:
Let d = no. of dimes
q = no. of quarters
10d = value of all the dimes since each dime is worth 10 cents
and 25q = value of all the quarters since each quarter is worth 25 cents
$44.90 = 4490 cents
10d + 25q = 4490 d + q = 212
<u> - 10d - 10q = -2120</u>
15q = 2370
q = 158 quarters d + 158 = 212
d = 54 dimes
You can see what I did here