Okay, so my teacher never went over any of the questions on my homework. Fortunately, I was able to figure out just about everything else but this question. Could someone help me out here?

A woman stands at a horizontal distance x from a mountain and measures the angle of elevation of the mountaintop above the horizontal as θ. After walking a distance d closer to the mountain on level ground, she finds the angle to be ϕ. Find a general equation for the height y of the mountain in terms of d, ϕ, and θ, neglecting the height of her eyes above the ground.

Question

Okay, so my teacher never went over any of the questions on my homework. Fortunately, I was able to figure out just about everything else but this question. Could someone help me out here?

A woman stands at a horizontal distance x from a mountain and measures the angle of elevation of the mountaintop above the horizontal as θ. After walking a distance d closer to the mountain on level ground, she finds the angle to be ϕ. Find a general equation for the height y of the mountain in terms of d, ϕ, and θ, neglecting the height of her eyes above the ground.

michele_laino · Answer

the situation of your problem is like below:
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