Aircraft mass.A general aviation of the aircraft with a wing surface area of 18 square meters flies at sea level with a speed of 180?

Question

Kilometres per hour it's lift curve shown below that lift equals to weight for this aircraft flies at 8 degrees angle of attack What is the mass in kilograms ?

Answer 1

". . .it's lift curve shown below. . ."  Did you, per chance, forget something?

Answer 2

360 kilogrammes