~CALCULATIONS IN FT~
9) The shape is a square
sqrt(x^2 + x^2) = 80
sqrt(2x^2) = 80
2x^2 = 6400
x^2 = 3200 [area of the square]
10) We have to find the height, we can use trigonometry.
sin(x) = O : H
sin(60°) = O : 4
O = 4 x sin(60°) = 3.46
Area = bh = 5 x 3.46 = 17.3 [or 17 to the nearest tenth]
