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In circle P with \( m \angle N P Q=96^{\circ} \) and \( N P=19 \) units, find the length of \( \overparen{N Q} \). Round to the nearest hundredth.

Ask by Davison Mccarthy. in the United States
Mar 11,2025

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Tutor-Verified Answer

Answer

The length of \( \overparen{NQ} \) is approximately \( 31.85 \) units.

Solution

1. Convert the central angle to radians: \[ \theta = 96^{\circ} \times \frac{\pi}{180} = \frac{96\pi}{180} = \frac{8\pi}{15} \] 2. Use the arc length formula \( s = r\theta \), where \( r = 19 \): \[ s = 19 \times \frac{8\pi}{15} = \frac{152\pi}{15} \] 3. Calculate the numerical value and round to the nearest hundredth: \[ s \approx \frac{152 \times 3.14159}{15} \approx 31.85 \text{ units} \] Thus, the length of \( \overparen{NQ} \) is approximately \( 31.85 \) units.

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Beyond the Answer

To find the length of \( \overparen{N Q} \) in circle P, we can use the Law of Cosines. We know the angle \( m \angle N P Q = 96^\circ \) and the radius \( N P = 19 \) units. Since \( N P \) and \( P Q \) are both radii of the circle, they are equal. Let's denote the length of \( N Q \) as \( c \). The sides of the triangle are: - \( a = N P = 19 \) units - \( b = P Q = 19 \) units - \( C = \angle N P Q = 96^\circ \) Using the Law of Cosines: \[ c^2 = a^2 + b^2 - 2ab \cdot \cos(C) \] Substituting in our values: \[ c^2 = 19^2 + 19^2 - 2 \cdot 19 \cdot 19 \cdot \cos(96^\circ) \] Calculating step-by-step: \[ c^2 = 361 + 361 - 2 \cdot 361 \cdot \cos(96^\circ) \] Now, the approximate value of \( \cos(96^\circ) \) is \( -0.1045 \): \[ c^2 = 361 + 361 - 2 \cdot 361 \cdot (-0.1045) \] \[ = 722 + 75.5089 \approx 797.5089 \] Taking the square root to find \( c \): \[ c = \sqrt{797.5089} \approx 28.24 \] Thus, the length of \( \overparen{N Q} \) is approximately **28.24** units.

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