some basic help on trigonometry

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romitvsingh: Senior | Next Rank: 100 Posts; Posts: 46; Joined: Fri Aug 19, 2011 12:13 amFollowed by: 1 member; Location: Delhi, India

by romitvsingh » Wed Dec 28, 2011 7:18 am

tan 45 degree = x/100

tan 45 degree * 100= x

therefore x= 100 feet , now my question is how do we get the value of x as 100 feet ?

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Source: Beat The GMAT — Problem Solving | Wed Dec 28, 2011 7:18 am

pemdas: Legendary Member; Posts: 1084; Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members; Thanked: 158 times

by pemdas » Wed Dec 28, 2011 10:42 am

it is really basic question
sin of angle is ratio of opposite side to hypotenuse
cos of angle is ratio of adjacent side to hypotenuse
tan of angle is sin/cos or ratio of opposite side to adjacent side

note your angle is 45, hence non-hypotenuse sides are equal and their ratio returns 1
hence tan 45=1 and 1=100/x implies x=100

romitvsingh wrote:tan 45 degree = x/100

tan 45 degree * 100= x

therefore x= 100 feet , now my question is how do we get the value of x as 100 feet ?

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