Pregunta
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etch and Solve each problem given below. Round your answers to two decimal places. 1.) The angle of elevation from point \( A \) to the top of a hill is \( 49^{\circ} \). If point \( A \) is 400 feet from the base of the hill, how high is the hill? 2.) Find the angle of elevation of the sun when a 12.5 -meter-tall telephone pole casts a 18 -meter- long shadow.

Ask by Reed Marshall. in the Philippines
Mar 20,2025

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1.) The hill is approximately 460.16 feet high. 2.) The angle of elevation of the sun is approximately 34.99 degrees.

Solución

1.) We are given the angle of elevation \( \theta = 49^{\circ} \) and the horizontal distance \( d = 400 \) feet. For a right triangle, the tangent of the angle is the ratio of the opposite side (hill height \( h \)) to the adjacent side (distance \( d \)). Thus, we have \[ \tan(49^{\circ}) = \frac{h}{400}. \] Solving for \( h \): \[ h = 400 \cdot \tan(49^{\circ}). \] Using a calculator for \( \tan(49^{\circ}) \): \[ \tan(49^{\circ}) \approx 1.15. \] Thus, \[ h \approx 400 \cdot 1.15 \approx 460.16 \text{ feet}. \] 2.) We are given the telephone pole height \( H = 12.5 \) meters and the length of the shadow \( s = 18 \) meters. The angle of elevation \( \theta \) is given by the relationship: \[ \tan(\theta) = \frac{H}{s} = \frac{12.5}{18}. \] Calculating the quotient: \[ \frac{12.5}{18} \approx 0.69. \] To find the angle \( \theta \), take the inverse tangent: \[ \theta = \arctan(0.69). \] Using a calculator: \[ \theta \approx 34.99^{\circ}. \] Thus, the angle of elevation of the sun is approximately \( 34.99^{\circ} \).

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To find the height of the hill, we can use the tangent function, which relates the angle of elevation to the opposite side (height of the hill) and the adjacent side (distance from point A). The formula is: height = distance × tan(angle). So, height = 400 × tan(49°) ≈ 400 × 1.144 = 457.60 feet. So, the hill is approximately 457.60 feet high! For the angle of elevation of the sun, we again use the tangent function. In this case, we have the height of the telephone pole as the opposite side and the length of the shadow as the adjacent side. We can find the angle with the formula: angle = arctan(opposite/adjacent). Thus, the angle = arctan(12.5/18) ≈ 36.87°. So, the angle of elevation of the sun is approximately 36.87 degrees!

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