The answer is soil depleted of nutrients because photosynthesis goes into the soil to the plants or from the plants. Which you are increasing the rate of photosynthesis
By "long = 3", I'm assuming you mean the longest leg is 3. In that case, the shortest leg would be 3/sqrt3 (since a 30-60-90 triangle's sides are: 1 to 2 to sqrt3), and the hypotenuse would be 2 * (3/sqrt3) = 6/sqrt3.
Answer:
Stores energy. Structural support.