Jean camps beside a wide river and wonders how wide it is, She spots a large rock on the bank directly across from her. She then walks upstream until she judges that the angle between her and the rock, which she can still see clearly, is now at an angle of 30o downstream (Fig. 1-17). Jean measures her stride to be about one yard long. The distance back to her cam is 120strides, About how far across, both in yards and in meters, is the river?

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30 120 Strides