document.write( "Question 256426: Please help with this word problem. An ant is 120 ft. from an 80 ft. tall tree whose top is the visual line of a 600 ft. tall building. How far is the tree from the building? Please explain every step. For example where you get numbers. Thank you so much. \n" ); document.write( "
Algebra.Com's Answer #188587 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! An ant is 120 ft. from an 80 ft. tall tree whose top is the visual line of a 600 ft. tall building. \n" ); document.write( " How far is the tree from the building? Please explain every step. \n" ); document.write( ": \n" ); document.write( "Find the angle of sight from the ant to the tree \n" ); document.write( "Use the tangent of the angle(A): Side opposite (80ft) over Side adjacent (120ft) \n" ); document.write( ": \n" ); document.write( "tan(A) = \n" ); document.write( "tan(A) = .6667 \n" ); document.write( "A = 33.69 degrees \n" ); document.write( ": \n" ); document.write( "Use the tan of the same angle to find the dist (d) from the ant to the building \n" ); document.write( "Side opposite (600) over side adjacent (d) \n" ); document.write( "tan(33.69) = \n" ); document.write( ".6667 - \n" ); document.write( "d = \n" ); document.write( "d = 900 ft from the Ant to the building \n" ); document.write( "therefore \n" ); document.write( "900 - 120 = 780 ft from the tree to the building \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "After seeing the problem, I read it again and see I made a mistake, I put 600 as the line of sight distance instead of the building height, Sorry. Obviously your teacher did it a different way. \n" ); document.write( ": \n" ); document.write( "Using a simpler method, ratios of corresponding sides: \n" ); document.write( "tree height to building height is to ant/tree dist to ant/building dist (x) \n" ); document.write( " \n" ); document.write( "cross multiply \n" ); document.write( "80x = 72000 \n" ); document.write( "x = \n" ); document.write( "x = ft from ant to building \n" ); document.write( "then \n" ); document.write( "900 - 120 = 720 ft from tree to building \n" ); document.write( ": \n" ); document.write( "Hope this helps\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |