Question

Hello everyone! I have some sample work I'm working on and having trouble with, please help!
And please show your work ^^
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Answer 1

Answer:

D: 286 $in^{2}$

Step-by-step explanation:

$\frac{1}{2}$ * 5.5 * 13 = 35.75 (area of one triangle)

35.75 * 8 = 286 (area of entire octagon)