According to the diagram, what is the altitude?
Use the Pythagorean Theorem,
In his case, you know a and c and need to find b . The names of the sides is really immaterial, but c is always the hypotenuse (the longest side).
Note that the answer has to be positive because it's a distance.
The altitude is 300 m.
if you name the triangle as ABC, where
By applying Pythagoras theorem,