4 The people of Bridgetown wanted to build a bridge across a nearby river. Since they were poor swimmers, their
master Trigonomos agreed to measure the width of the river without actually crossing it. Trigonomos spotted a
tree across the river and marked the spot directly across from it. Then he walked to another point 15 m down
the river and found that the angle between side and the line connecting him to the tree was 76º.
B
What is the width (in meters) of the river? Round your final answer to the nearest hundredth of a meter.
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