Use the image to answer the question.

a triangle upper A upper B upper C; The edge upper A upper B is labeled c. The edge upper A upper C is labeled b. The edge upper B upper C is labeled a.

If the area of △ABC=134 square feet, m∠C = 41° , and b=24 feet, then what is the length of side a ? Round your answer to the nearest whole number.

(1 point)
Responses

15 feet
15 feet

16 feet
16 feet

9 feet
9 feet

17 feet

1 answer

To find the length of side \( a \) in triangle \( ABC \), we can use the formula for the area of a triangle involving two sides and the included angle:

\[ \text{Area} = \frac{1}{2} \times b \times c \times \sin(A) \]

However, since we need to find side \( a \), we first use the formula for the area in terms of the sides \( a \), \( b \), \( c \) and the angle \( C \):

\[ \text{Area} = \frac{1}{2} \times a \times b \times \sin(C) \]

Given the values:

  • Area = 134 square feet
  • \( b = 24 \) feet
  • \( C = 41^\circ \)

We can substitute these values into the area formula:

\[ 134 = \frac{1}{2} \times a \times 24 \times \sin(41^\circ) \]

Now, we can solve for \( a \):

  1. First, calculate \( \sin(41^\circ) \):

\[ \sin(41^\circ) \approx 0.6561 \quad (\text{using a calculator}) \]

  1. Substitute this back into the equation:

\[ 134 = \frac{1}{2} \times a \times 24 \times 0.6561 \]

  1. Simplify the equation:

\[ 134 = 12a \times 0.6561 \] \[ 134 = 7.8732a \]

  1. Now, solve for \( a \):

\[ a = \frac{134}{7.8732} \approx 17.0 \]

Rounding this to the nearest whole number gives:

\[ a \approx 17 \text{ feet} \]

Thus, the length of side \( a \) is approximately \( \boxed{17} \) feet.

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