A 4-Edged flat shape with straight edges that has a pair of opposite edges parallel which is called trapezoidal.
Edge(A) = 15 m,Edge(B) = 23 m
Height(h) = 9 m, Area (A) = ?
Area (A) = ((A + B) * h ) / 2
Area (A) = ((15 + 23) * 9) / 2
Area (A) = 171 m2