Find the missing side and angle measures in triangle ABC. Round your answers to the nearest tenth. The measure of angle B is approximately
__.

The measure of angle C is approximately
__.

The length of side AB is approximately
___units.

Side AB measures approximately 20.15 units.

Step-by-step explanation:

We can use the Law of Sines, given by:

Since we already know ∠A and a, we can use it to determine our other measures.

We know that b is 23. Substitute:

Solve for ∠B:

We can take the inverse sine of both sides:

Use a calculator (make sure you're in Degrees mode!):

The interior angles of a triangle must total 180°. Hence:

Substitute in known values:

Therefore:

Lastly, to find AB or c, we can use the Law of Cosines:

a = 15, b = 23, and to prevent rounding errors, we will use the exact value for C. Recall that we know that:

Using the exact value for ∠B, we acquire:

Therefore:

Substitute:

Simplify and take the square root of both sides.

And use a calculator:

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: