Question

The horizontal distance that corresponds to the part of the trip where Gottfried's altitude is increasing is a, the horizontal distance that corresponds to the part of the trip where he is at cruising altitude is b, and the horizontal distance that corresponds to the part of the trip where his altitude is decreasing is c.
What is the approximate value of a?
A. 11.8km
B. 1.9km
C. 76.7km
D. 75.8km

I think its A

Answer 1

A should be the answer

Answer 2

We can find the value of a with ratio of tan.
tan angle = the side in front of angle / the side adjacent to the angle

No need to look at the other parts, just focus on the part when altitude is increasing (the left side of the image)
tan 9° = 12/a
a = 12 / tan 9°
a = 12 / 0.1583
a = 75.8

The answer is d. 75.8 km