Natalia and Julia measured the height of their school gym by comparing the length of Natalia's shadow to the shadow of the gym. They found that when the gym's shadow was 6 meters, Natalia's shadow was 1.8 meters. Using this information and Natalia's height of 1.66 meters, they calculated the height of the gym to be 5.53 meters. The actual height of the gym is 6.1 meters.