Given angle B is 94 degrees, use the Law of Sines to find the measure of angle C if b=13 inches and c=6 inches. Round your answer to the nearest degree.

1 answer

To find the measure of angle \( C \) using the Law of Sines, we start with the relationship given by the Law of Sines:

\[ \frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C} \]

We know that:

  • \( B = 94^\circ \)
  • \( b = 13 \) inches
  • \( c = 6 \) inches

We can first find the side length \( a \) using the formula:

\[ \frac{b}{\sin B} = \frac{c}{\sin C} \]

This allows us to isolate the sine of angle \( C \):

\[ \frac{c}{\sin C} = \frac{b}{\sin B} \]

Rearranging gives:

\[ \sin C = \frac{c \cdot \sin B}{b} \]

Plugging in the values we have:

\[ \sin C = \frac{6 \cdot \sin(94^\circ)}{13} \]

Now, we calculate \( \sin(94^\circ) \):

\[ \sin(94^\circ) \approx 0.998 \]

Now substituting this value in:

\[ \sin C \approx \frac{6 \cdot 0.998}{13} \]

Calculating this gives:

\[ \sin C \approx \frac{5.988}{13} \approx 0.4606 \]

Next, we find angle \( C \) by taking the inverse sine:

\[ C \approx \sin^{-1}(0.4606) \]

Using a calculator, we find:

\[ C \approx 27.4^\circ \]

Rounding this to the nearest degree gives:

\[ C \approx 27^\circ \]

Therefore, the measure of angle \( C \) is approximately 27 degrees.