In the triangle, angle B is 52 degrees and angle A is 14 degrees. If side c has a length of 17 cm, use the Law of Sines to find the length of side b. Round your answer to the nearest centimeter. (1 point) cm

1 answer

In triangle \(ABC\), we have:

  • Angle \(A = 14^\circ\)
  • Angle \(B = 52^\circ\)
  • Side \(c = 17\) cm (opposite angle \(C\))

First, we need to find angle \(C\):

\[ C = 180^\circ - A - B = 180^\circ - 14^\circ - 52^\circ = 114^\circ \]

Now we can use the Law of Sines, which states:

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

We want to find the length of side \(b\):

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

Substituting the known values:

\[ \frac{b}{\sin 52^\circ} = \frac{17}{\sin 114^\circ} \]

Now, we can calculate \(\sin 52^\circ\) and \(\sin 114^\circ\):

  • \(\sin 52^\circ \approx 0.7880\)
  • \(\sin 114^\circ \approx \sin(180^\circ - 66^\circ) = \sin 66^\circ \approx 0.9135\)

Now substitute these values into the equation:

\[ \frac{b}{0.7880} = \frac{17}{0.9135} \]

Now, solve for \(b\):

\[ b = 17 \times \frac{0.7880}{0.9135} \]

Calculating the right-hand side:

\[ b \approx 17 \times 0.8618 \approx 14.65 \text{ cm} \]

Rounding to the nearest centimeter:

\[ b \approx 15 \text{ cm} \]

Therefore, the length of side \(b\) is approximately \(\boxed{15}\) cm.

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