Doubt in geometry

GRE Quant Problem Solving
1

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How’d you approach this problem though? All your valuable inputs are welcome. Thanks!

2

This one is easier than it looks. Determine the height of the equilateral triangle, and find which option satisfies that. A graph would help.

3

@Leaderboard How do I determine it’s height?

4

Graph it first.

5

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yep
I used the formula for the height of an equilateral triangle, (a*root(3)/2)