Trigonometry
Determine the distance from Point A to the top of the tree. (The tree in the big triangle makes a 90 degree angle with the ground and the smaller triangle is a similar triangle. The bottom of the tree is 30m from point A) show your work
you do not give nearly enough information.
But you do know that the sides of the triangles are in the same ratio. So if you are looking for the hypotenuse of the large triangle, just use the sides that are given to get the ratio.