### All High School Math Resources

## Example Questions

### Example Question #1 : Applying Trigonometric Functions

In this figure, side , , and . What is the value of angle ?

**Possible Answers:**

Undefined

**Correct answer:**

Since , we know we are working with a right triangle.

That means that .

In this problem, that would be:

Plug in our given values:

### Example Question #2 : Applying Trigonometric Functions

Let ABC be a right triangle with sides = 3 inches, = 4 inches, and = 5 inches. In degrees, what is the where is the angle opposite of side ?

**Possible Answers:**

**Correct answer:**

We are looking for . Remember the definition of in a right triangle is the length of the opposite side divided by the length of the hypotenuse.

So therefore, without figuring out we can find

### Example Question #3 : Applying Trigonometric Functions

In this figure, if angle , side , and side , what is the measure of angle ?

**Possible Answers:**

Undefined

**Correct answer:**

Since , we know we are working with a right triangle.

That means that .

In this problem, that would be:

Plug in our given values:

### Example Question #1 : Triangles

In this figure, , , and . What is the value of angle ?

**Possible Answers:**

Undefined

**Correct answer:**

Notice that these sides fit the pattern of a 30:60:90 right triangle: .

In this case, .

Since angle is opposite , it must be .

### Example Question #2 : Graphs And Inverses Of Trigonometric Functions

A triangle has angles of . If the side opposite the angle is , what is the length of the side opposite ?

**Possible Answers:**

**Correct answer:**

The pattern for is that the sides will be .

If the side opposite is , then the side opposite will be .

### Example Question #2 : Triangles

In , , , and . To the nearest tenth, what is ?

**Possible Answers:**

A triangle with these sidelengths cannot exist.

**Correct answer:**

By the Triangle Inequality, this triangle can exist, since .

By the Law of Cosines:

Substitute the sidelengths and solve for :

### Example Question #3 : Triangles

A triangle has sides of length 12, 17, and 22. Of the measures of the three interior angles, which is the greatest of the three?

**Possible Answers:**

**Correct answer:**

We can apply the Law of Cosines to find the measure of this angle, which we will call :

The widest angle will be opposite the side of length 22, so we will set:

, ,

### Example Question #4 : Triangles

In , , , and . To the nearest tenth, what is ?

**Possible Answers:**

A triangle with these characteristics cannot exist.

**Correct answer:**

By the Law of Cosines:

or, equivalently,

Substitute:

### Example Question #1 : Applying The Law Of Sines

In this figure, angle and side . If angle , what is the length of side ?

**Possible Answers:**

**Correct answer:**

For this problem, use the law of sines:

.

In this case, we have values that we can plug in:

Cross multiply:

Multiply both sides by :

### Example Question #2 : Applying The Law Of Sines

In this figure and . If , what is ?

**Possible Answers:**

**Correct answer:**

For this problem, use the law of sines:

.

In this case, we have values that we can plug in: