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

9 feet
9 feet

16 feet
16 feet

17 feet
17 feet

15 feet

1 answer

To find the length of side \( a \) in triangle \( ABC \) given the area, side \( b \), and angle \( C \), we can use the formula for the area of a triangle:

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

Here, we know:

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

Plugging the known values into the area formula, we can solve for \( a \):

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

Now, calculate \(\sin(41^\circ)\):

\[ \sin(41^\circ) \approx 0.6561 \]

Substituting this value into the equation gives:

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

This simplifies to:

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

Calculating \( 12 \times 0.6561 \):

\[ 12 \times 0.6561 \approx 7.9932 \]

Now, we can substitute this back into the equation:

\[ 134 = 7.9932 \times a \]

To solve for \( a \):

\[ a = \frac{134}{7.9932} \approx 16.76 \]

Rounding this to the nearest whole number, we find:

\[ a \approx 17 \]

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

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