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18 Jan 2019, 00:14
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E
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Difficulty:
45%
(medium)
Question Stats:
56% (01:25) correct
44%
(01:53)
wrong
based on 61
sessions
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The base of a 20-foot rope is 8 feet above the ground. If the rope is extended at a 60-degree angle, the top of the rope will be how many feet above the ground?
A 18
B 28
C 10√3
D 10√2 + 8
E 10√3 + 8
A 18
B 28
C 10√3
D 10√2 + 8
E 10√3 + 8
Archit3110
Major Poster
18 Jan 2019, 06:42
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Bunuel
draw figure
base is 8 feet above ground , angle 60* subtended at base so rope is making 30:60:90 triangle
30 ; 10
so and 60 * = 10 sqrt 3
height of top of rope 10√3 + 8
IMO E
