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Triangle LMN is an obtuse triangle with \( I=6, n=8.3 \), and \( m \angle M=132^{\circ} \). What is the area of \( \triangle L M N \) ? Round your answer to the nearest tenth. 10.2 square units 18.5 square units 24.9 square units 37.0 square units

Ask by Macdonald Montgomery. in the United States
Mar 11,2025

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The area of triangle \( LMN \) is approximately 49.8 square units, which does not match any of the provided options.

Solución

To find the area of triangle \( LMN \) given the inradius \( I = 6 \), the semi-perimeter \( n = 8.3 \), and the angle \( \angle M = 132^\circ \), we can use the formula for the area \( A \) of a triangle in terms of its inradius and semi-perimeter: \[ A = I \cdot n \] Now, substituting the known values: \[ A = 6 \cdot 8.3 \] Let's calculate this: \[ A = 49.8 \] Now, we need to round this to the nearest tenth. The area of triangle \( LMN \) is: \[ A \approx 49.8 \text{ square units} \] However, this value does not match any of the provided options. Let's check if we can use another method to find the area using the angle and the sides. Since we have an obtuse triangle, we can use the formula for the area of a triangle given two sides and the included angle: \[ A = \frac{1}{2}ab \sin(C) \] However, we do not have the lengths of sides \( a \) and \( b \). Given that we have the inradius and semi-perimeter, we can also use the relationship between the area, inradius, and semi-perimeter: \[ A = r \cdot s \] Where \( r \) is the inradius and \( s \) is the semi-perimeter. Let's calculate the area again using the inradius and semi-perimeter: \[ A = 6 \cdot 8.3 = 49.8 \] Since this value does not match any of the options, we can conclude that the area of triangle \( LMN \) is not among the provided choices. However, if we consider the options given, the closest area to our calculated value of \( 49.8 \) is not present. Thus, the area of triangle \( LMN \) is approximately \( 49.8 \) square units, which does not match any of the provided options. If we need to select from the options, we would need to re-evaluate the problem or check for any additional information that might lead to a different calculation. Please confirm if there are any additional details or if we should proceed with a different approach.

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Bonus Knowledge

To find the area of triangle LMN, we can use the formula for the area of a triangle given two sides and the included angle: \[ \text{Area} = \frac{1}{2} \times a \times b \times \sin(C) \] In this case: - \( a = I = 6 \) - \( b = n = 8.3 \) - \( C = \angle M = 132^\circ \) Now, we need to calculate the sine of 132 degrees. Using a calculator or trigonometric tables, we find: \[ \sin(132^\circ) \approx 0.846 \] Now we can plug in the values: \[ \text{Area} = \frac{1}{2} \times 6 \times 8.3 \times 0.846 \] \[ \text{Area} = 3 \times 8.3 \times 0.846 \] \[ \text{Area} \approx 3 \times 7.0058 \approx 21.0174 \] Now, rounding it to the nearest tenth, we find: \[ \text{Area} \approx 21.0 \text{ square units} \] However, your answer options do not match this area calculation. Based on the computed area, it appears none of the options provided directly match this outcome, but among the options, 24.9 square units is the closest to the calculated area. Double-check all calculations to confirm the inputs and trigonometric outputs were accurate. The area of triangle LMN is approximately 21.0 square units, although it may warrant investigation if sticking to the provided answers!

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