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OpenStudy (anonymous):
A helium-filled balloon is attached to a long string and is at a height of 78 m from the ground. The string is tied to a hook on the ground and makes an angle of 30° with the ground, as shown below. What is the length of the string, in meters? 90.07 m 78 m 110.29 m 156 m http://gyazo.com/6c53531e5000b5b1f47d45461e17232a
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OpenStudy (anonymous):
Use sin, do you know it?
OpenStudy (anonymous):
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