To indirectly measure the distance across a river, Zachary stands on one side of the river and uses sight-lines to a landmark on the opposite bank. Zachary draws the diagram below to show the lengths and angles that he measured. Find PR, the distance across the river. Round your answer to the nearest foot.

To indirectly measure the distance across a river Zachary stands on one side of the river and uses sightlines to a landmark on the opposite bank Zachary draws t class=