Can someone help me with thise geometry? It's polygons

Here is the link. Numbers 7-10. You're supposed to find the area of them. Thanks.

http://locker.palcs.org/~kwesley/Geometry%20CS/Chapter%209/9-2%20apothem%20worksheet.pdf

7. This one has a perimeter of 96 cm.
Its apothem is 6 cm times cot (22.5 degrees).
You do the arithmetic, A = (1/2) aP.

#8. Apothem is 4 inches,
perimeter is 10 times 4 inches times tan(36 degrees),
A = (1/2) a P

#9. Apothem is 3 m,
perimeter is 12 times 3m times tan(30 degrees),
A = (1/2) aP

#10. Perimeter is 70 ft,
apothem is 3.5 ft cot(18 degrees),
A = (1/2) aP