  
  There are several ways to calculate the tower's height. Method 1, learned in grade 9, involves measuring a distance from the base of the tower using a tape, and then measuring the angle to the top of the tower with a clinometer. Here is the calculation the students did when they returned to the classroom: 
Method 2 is learned in grade 10, and although the calculations are a little more work, the method is more practical. It involves making two angle measurements, and a distance measurement in between. Because the distance can be measured well away from the tower, it makes everything easier to do ... especially if there is a crocodile-infested river between you and the tower! Here is the calculation students do in Math 10: 
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