Our altitude is *a*. If we were on a plane, it would be 38,000 feet but thank goodness we aren't. First, we have to figure out how to set up our proportion. Looking at the two smaller triangles, we'll put the long sides on the top and the short sides on the bottom. Now, we use the geometric mean. If we cross-multiply, we get this equation. *a*^{2} = 3.2 × 1.8
Plugging 3.2 × 1.8 into our calculator gives us 5.76. Hopefully our answer won't be a big ugly decimal. If we take the square root, we get a nice, clean number: 2.4. | |