A.
This is because in each circle the lines increase by one, so from the triangle (3 lines) to the rectangle (4 lines) it only makes sense to put a pentagon (5 lines)
Answer:
<h2><em><u>
3.24</u></em> </h2>
<em><u>= yes, because the sqrt of 3.24 is 1.8</u></em>
<h2><em><u>
20.25</u></em></h2><h3>= yes, because the sqrt of 20.25 is 4.5</h3>
Since there is no semicircle, the angle is 0.