From a boat on the lake, the angle of elevation to the top of a cliff is 27°57'. If the base of the cliff is 128 feet from the boat, how high is the cliff (to the nearest foot)?

Question

anonymous · Answer

when i did it i got -108.76 i used tan tho so i think it might be wrong

anonymous · Answer

58 ft

 68 ft

 78 ft

 81 ft
 answers u can choose from so i know i did something wrong cuz it dosnt match :o

anonymous · Answer

$$\tan(27^o57')=\frac{x}{128}$$
$$x=128\times \tan(27^o57')$$

anonymous · Answer

oh wow thx i put it in calculater wrong xD
FAIL!

anonymous · Answer

yeah it is hard because you have to make sure that the calculator is in degree mode and also you have to convert to seconds to a decimal

anonymous · Answer

yea >.< i always forget

anonymous · Answer

http://www.wolframalpha.com/input/?i=128+tan%2827+degrees+57%27%29

anonymous · Answer

cool didnt know that site could do that :o

anonymous · Answer

lol .-.