Question 1111548
ODC is a right triangle
CD is the hypotenuse

100^2 = 80^2+OC^2

OC^2= 100^2-80^2

OC^2 = 3600

OC =60

shorter diagonal = 2*60 =120

Area of rhombus = 1/2 * product of diagonals

= 1/2 * 120 *160
=9600 m^2