### All PSAT Math Resources

## Example Questions

### Example Question #1 : How To Find The Length Of An Edge Of A Tetrahedron

Refer to the above *tetrahedron, *or four-faced solid.* *The surface area of the tetrahedron is 444. Evaluate to the nearest tenth.

**Possible Answers:**

**Correct answer:**

Explanation:

The tetrahedron has four faces, each of which is an equilateral triangle with sidelength . Since the total surface area is 444, each triangle has area one fourth of this, or 111. To find , set in the formula for the area of an equilateral triangle:

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### All PSAT Math Resources

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