Using the formula for area for a parallelogram, A=BH, where A is area, B is Base, and H is height, you follow that. So in this case, you would want to find one of the area's then multiply it by 4. So for the area you get 20.52 meters. If you multiply it by 4, you get 82.08 meters. Have a nice day!
The HL theorem is a special case of the SSS postulate.
Here's my interpretation of your equation:
P=175e^(-0.090*25) (not P=175e^-0.090times 25 )
Then P = 175(0.105) = 18.4, or approx 18.