We can use Pythagorean theorem for right angle triangle to solve this problem.
The diagonal line would be hypothenuze. Horizontal and vertical distance would be other two sides of a triangle.
We will use the following formulas:

Where opposite side is vertical distance and adjacent side is horizontal distance.
Solving for these two sides we have:

We insert numbers and we get solution:
Answer:
the second one
Step-by-step explanation:
the second one
36) 308 ft^2. This can be determined by multiplying the three side lengths.
35) 85 ft^2
Answer:
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Step-by-step explanation: