### All Advanced Geometry Resources

## Example Questions

### Example Question #1 : How To Find The Surface Area Of A Tetrahedron

What is the surface area of the following tetrahedron? Assume the figure is a regular tetrahedron.

**Possible Answers:**

**Correct answer:**

A tetrahedron is a three-dimensonal figure where each side is an equilateral triangle. Therefore, each angle in the triangle is .

In the figure, we know the value of the side and the value of the base . Since dividing the triangle by half creates a triangle, we know the value of must be .

Therefore, the area of one side of the tetrahedron is:

Since there are four sides of a tetrahedron, the surface area is:

### Example Question #51 : Solid Geometry

A regular tetrahedron has side lengths . What is the surface area of the described solid?

**Possible Answers:**

**Correct answer:**

The area of one face of the triangle can be found either through trigonometry or the Pythagorean Theorem.

Since all the sides of the triangle are , the height is then, so the area of each face is:

There are four faces, so the area of the tetrahedron is:

### Example Question #3 : How To Find The Surface Area Of A Tetrahedron

Find the surface area of a regular tetrahedron with a side length of .

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

### Example Question #4 : How To Find The Surface Area Of A Tetrahedron

Find the surface area of a regular tetrahedron with a side length of .

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

### Example Question #5 : How To Find The Surface Area Of A Tetrahedron

In terms of , find the surface area of a regular tetrahedron that has a side length of .

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

### Example Question #61 : Advanced Geometry

In terms of , find the surface area of a regular tetrahedron with side lengths of .

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

### Example Question #62 : Advanced Geometry

The surface area of a regular tetrahedron is . If the length of each side is , find the value of .

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

Now, solve for .

### Example Question #63 : Advanced Geometry

The surface area of a regular tetrahedron is . If each side length is , find the value of . Round to the nearest tenths place.

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

Solve for .

### Example Question #64 : Advanced Geometry

The surface area of a regular tetrahedron is . If each side length is , find the value of . Round to the nearest tenths place.

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation.

### Example Question #65 : Advanced Geometry

The surface area of a regular tetrahedron is . If each side length is , find the value of .

**Possible Answers:**

**Correct answer:**

Use the following formula to find the surface area of a regular tetrahedron.

Now, substitute in the value of the side length into the equation and solve for .

Since we are dealing with a 3-dimensional shape, only is valid.