### All GRE Math Resources

## Example Questions

### Example Question #101 : Plane Geometry

An equilateral triangle has a side length of 4. What is its height?

**Possible Answers:**

2√2

16

4

2

2√3

**Correct answer:**

2√3

Explanation:

If an equilateral triangle is divided in 2, it forms two 30-60-90 triangles. Therefore, the side of the equilateral triangle is the same as the hypotenuse of a 30-60-90 triangle. The side lengths of a 30-60-90 triangle adhere to the ratio x: x√3 :2x. since we know the hypothesis is 4, we also know that the base is 2 and the height is 2√3.

### All GRE Math Resources

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