Elementary Geometry For College Students, 7e
Elementary Geometry For College Students, 7e
7th Edition
ISBN: 9781337614085
Author: Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher: Cengage,
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**Problem 20: Kite Elevation Calculation** The straight string of a kite makes an angle of elevation from the ground of 60°. The length of the string is 400 feet. What is the best approximation of the height of the kite? **Options:** - A. 200 ft - B. 250 ft - C. 300 ft - D. 350 ft **Explanation:** To find the height of the kite, we can use trigonometry. Specifically, the sine function relates the angle of elevation to the opposite side (the height of the kite) and the hypotenuse (the length of the string). \[ \sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}} \] Here, \(\theta = 60^\circ\) and the hypotenuse is 400 ft. We want to find the opposite side, which is the height of the kite. \[ \sin(60^\circ) = \frac{\text{height}}{400} \] The sine of 60 degrees is \(\sqrt{3}/2\) or approximately 0.866. \[ 0.866 = \frac{\text{height}}{400} \] \[ \text{height} = 400 \times 0.866 \approx 346.4 \, \text{ft} \] Thus, the best approximation of the height of the kite is **350 ft**.
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Transcribed Image Text:**Problem 20: Kite Elevation Calculation** The straight string of a kite makes an angle of elevation from the ground of 60°. The length of the string is 400 feet. What is the best approximation of the height of the kite? **Options:** - A. 200 ft - B. 250 ft - C. 300 ft - D. 350 ft **Explanation:** To find the height of the kite, we can use trigonometry. Specifically, the sine function relates the angle of elevation to the opposite side (the height of the kite) and the hypotenuse (the length of the string). \[ \sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}} \] Here, \(\theta = 60^\circ\) and the hypotenuse is 400 ft. We want to find the opposite side, which is the height of the kite. \[ \sin(60^\circ) = \frac{\text{height}}{400} \] The sine of 60 degrees is \(\sqrt{3}/2\) or approximately 0.866. \[ 0.866 = \frac{\text{height}}{400} \] \[ \text{height} = 400 \times 0.866 \approx 346.4 \, \text{ft} \] Thus, the best approximation of the height of the kite is **350 ft**.
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