Question

When a river​ flows, the strength or force of the river depends on how far the river falls vertically compared to how far it flows horizontally. Find the slope of the river shown to the right.​
87ft & 387Ft

Answer 1

I think this is Pythagoras' theorem you are asking for
a^2+b^2=c^2

87^2+387^2=157338
Square root of 157338 = slope = 396.6585
396.66 ft