The first one is 4
Second is 5/9
Third is 1/2
Fourth is 11
Divide both numbers in one of the ratios by their highest common factor. This will give you the scale factor of the bigger triangle to the smaller triangle.
Tanα=5/12
α=arctan(5/12)°
α≈22.62° (to nearest hundredth of a degree)
The answer should be 3.8
You can find this by dividing the total descent by the minutes the descent took
