You need to post a graphic. I tried drawing my own, but I do not know where point "P" is nor where point "R" is.
3b+1.89+5b+3.15=77.04
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Find the area as iff it was a rectangle, then subtract the area of the triangle in the top left corner.
Area of rectangle = 20 x 18 = 360
Area of triangle = 1/2 x 4 x 3 = 6
Area of pentagon = 360 - 6 = 354 cm^2
See picture:
