a swimming pool 9 m wide and 12 m long is 1 m deep on the shallow side and 4 m deep on the deeper side . its volume is ?
"volume will be length * breadth * height , but in this case two heights are given so we will take average , volume = ( 12 ∗ 9 ∗ ( 1 + 42 ) ) m 312 ∗ 9 ∗ 2.5 m 3 = 270 m 3 answer : c"
multiply(quadrilateral_area(12, 1, 4), 9)