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An electrician leans an extension ladder against the outside wall of a house so that it reaches an electric box 27 feet up. The ladder makes an angle of \( 62^{\circ} \) with the ground. Find the length of the ladder. Round your answer to the nearest tenth of a foot if necessary.

Ask by Howell Turner. in the United States
Dec 03,2024

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Tutor-Verified Answer

Answer

The length of the ladder is approximately 30.6 feet.

Solution

To find the length of the ladder, we can use the relationship between the height the ladder reaches, the angle it makes with the ground, and the length of the ladder itself. We can use the sine function from trigonometry, which relates the angle, the opposite side (height), and the hypotenuse (length of the ladder). Given: - Height (opposite side) = 27 feet - Angle with the ground = \( 62^{\circ} \) The sine function is defined as: \[ \sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}} \] In this case, we can rearrange the formula to solve for the hypotenuse (length of the ladder): \[ \text{hypotenuse} = \frac{\text{opposite}}{\sin(\theta)} \] Substituting the known values: \[ \text{hypotenuse} = \frac{27}{\sin(62^{\circ})} \] Now, we need to calculate \(\sin(62^{\circ})\): \[ \sin(62^{\circ}) \approx 0.8829 \] Now we can substitute this value back into the equation: \[ \text{hypotenuse} = \frac{27}{0.8829} \approx 30.6 \] Thus, the length of the ladder is approximately: \[ \boxed{30.6} \text{ feet} \]

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To find the length of the ladder, we can use the sine function from trigonometry. The sine of the angle is defined as the ratio of the opposite side (height of the electric box) over the hypotenuse (length of the ladder). Using the formula: \[ \sin(62^{\circ}) = \frac{\text{opposite}}{\text{hypotenuse}} = \frac{27}{L} \] Where \(L\) is the length of the ladder. Rearranging gives: \[ L = \frac{27}{\sin(62^{\circ})} \] Calculating \(\sin(62^{\circ}) \approx 0.8870\): \[ L \approx \frac{27}{0.8870} \approx 30.5 \text{ feet} \] Thus, the length of the ladder is approximately **30.5 feet**. --- In the realm of physics and engineering, understanding angles and measurements is crucial for ensuring safety. Proper ladder placement can prevent accidents, which is why angles such as \(62^{\circ}\) are often recommended for optimal stability. When setting up a ladder, remember that the base should be about one-fourth the height of the wall being reached. For a height of 27 feet, you'd want the base about 6.75 feet away from the wall to keep things safe and stable. Happy climbing, and always be cautious!

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