Answer: 
Step-by-step explanation:
Given: The approximate height of Mountain Rainier h= 2.7 miles
The radius of earth = 3959 miles.
Let d be the distance to the horizon from this point.
We know that the line of sight to the horizon , the radius at the horizon and the radius at the mountain from a right angle triangle.
Therefore, by Pythagoras's theorem we have

Hence, the distance to the horizon from this point= 
Exactly the same as you would do to simplify any other fraction . . .
divide top and bottom by their greatest common factor.
The greatest common factor of 77 and 84 is 7 .
2*3*6 for large, 2*2*6 for med, 2*2*3 for small with 72 square cm as the surface area