The answer is 67°. Since the parallel sides of a trapezoid are called bases, the bases in our given trapezoid are AB and DC. We know that the corresponding pairs of base angles, such as ∠A and ∠D, or ∠B and ∠C, are supplementary, therefore, their angles add up to 180 degrees: ∠A + ∠D = 180° ∠B + ∠C = 180° Given that m∠A = 113°, we can calculate for the measure of ∠D: 113° + ∠D = 180° ∠D = 180° - 113° = 67°
So the distance that he is off by is 1 mile. The question is what percent of 14.5, 1 is. Take the top of the last fraction, and that's the proper percentage; 6.9%