document.write( "Question 437230: A kite flying 20 ft. above the ground is attached to a string 80 ft. long. The string is being held by a person on the ground.if the kite fell vertically to the ground, how far away from the stake would the kite land? \n" ); document.write( "
Algebra.Com's Answer #853278 by ikleyn(53427)\"\" \"About 
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\n" ); document.write( "A kite flying 20 ft. above the ground is attached to a string 80 ft. long.
\n" ); document.write( "The string is being held by a person on the ground. if the kite fell vertically to the ground,
\n" ); document.write( "how far away from the stake would the kite land?
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\n" ); document.write( "\n" ); document.write( "In his solution, @mananth uses this scheme\r
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document.write( "    Find sin of the angle --->  find arcsin  --->  find cos --->  find the horizontal distance.\r\n" );
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\n" ); document.write( "\n" ); document.write( "In this scheme, one step is excessive.\r
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\n" ); document.write( "\n" ); document.write( "The better scheme is\r
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document.write( "    find sin(a)  --->  find cos(a) = \"sqrt%281-sin%5E2%28a%29%29\"  --->  find the horizontal distance.\r\n" );
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\n" ); document.write( "\n" ); document.write( "I will use this improved scheme in my calculation\r
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\n" ); document.write( "\n" ); document.write( "        (1)   Find  sin(a)  of angle of depression   sin(a) = \"20%2F80\" = \"1%2F4\".\r
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\n" ); document.write( "\n" ); document.write( "        (2)   Find  cos(a) = \"sqrt%281+-+sin%5E2%28a%29%29\" = \"sqrt%281+-+%281%2F4%29%5E2%29\" = 0.968245837.\r
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\n" ); document.write( "\n" ); document.write( "        (3)   Horizontal distance = 80*cos(a) = 80*0.968245837 = 77.46 ft  (approximately).         ANSWER
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\n" ); document.write( "\n" ); document.write( "It is how this problem IS EXPECTED to be solved.\r
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