Question

Two birds sit at the top of two different trees 17.8 feet away from one another. The distance between the first bird and a bird watcher on the ground is 37.4 feet.

What is the angle measure, or angle of depression, between this bird and the bird watcher?

Answer 1

25.5°

64.5°

28.4°

61.6°

Answer 2

@ganeshie8 hey can you help me with this i think it is either 28.4 or 61.6?

Answer 3

@qweqwe123123123123111 do you think its 28.4 or 61.6?

Answer 4

we need to find angle x, so lets go to left bird corner, and look at the triangle :-

adjacent side = 17.8
hypotenuse = 37.4

Answer 5

what trig ratio can we use ?

Answer 6

i dont know

Answer 7

ok no probs. here it is :-

cos = adjacent / hypotenuse

Answer 8

@ganeshie8 are my guesses right though?

Answer 9

yes, one of them is right.

Answer 10

but guessing is very very bad huh when we can solve them directly. solving is the King's way. lets solve it.

Answer 11

@ganeshie8 okay, im fine with solving it

Answer 12

@ganeshie8 just dont know how

Answer 13

yea we must use calculator.

cos(x) = adjacent /hyp
= 17.8/37.4

x = acos(17.8/37.4)

Answer 14

do you knw how to do acos in your calculator ?

Answer 15

if not, you can type it in wolfram. like below :-

http://www.wolframalpha.com/input/?i=acos%2817.8%2F37.4%29

Answer 16

@ganeshie8 no i dont, so do i just use that link?

Answer 17

yes click the link. you can use wolfram as your online calculator

Answer 18

have a look u wil understand easily

Answer 19

@ganeshie8 all that did was confuse me

Answer 20

ok sorry about that. you wont be able to do these without knowing how to use calculator.