Well for constructing your gonna need a compass and measure the length of the line your constructing and a drawing is just a free draw without a compass perpendicular lines are straight on both sides
3.8 / 1.9 = x / 7.6....3,8 miles to 1.9 miles = x miles to 7.6 miles cross multiply (1.9)(x) = (3.8)(7.6) 1.9x = 28.88 x = 28.88 / 1.9 x = 15.2 <== Cameron ran 15.2 miles