A trapezoid with legs MN = FD is an isosceles trapezoid. An isosceles trapezoid has diagonals that are congruent, therefore: MF = ND. A quadrilateral with diagonals congruent and perpendicular is a square. In a square, the height coincides with the side. The area of a square is given by A = s² Therefore, the area of MNFD is h²
When the ball hit the ground, the height of the ball will be zero. So using the value of h(x) as zero in the given equation, we can find the time in which the ball will hit the ground.
This means the ball will hit the ground 6 seconds after Amir threw it