Help!

You are a surveyor. You stand on the north bank of a river and look due south at a tree on the opposite bank. Your friend on the opposite bank measures 35 yards due east to a second tree. You must rotate your transit through an angle of 21' to point toward the second tree. See the following figure. Transit 210 for Cole River Tree 35 Tree How wide is the river? (Use decimal notation. Give your answer to two decimal places.) feet width of the river: 98.74 Incorrect