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alright, let's split the distance between the wall into two pieces, A and B, ok? we're going to solve for A and B using trigonometry |dw:1435783301582:dw|
I got 90m
as the final answer, or for A?
as for the final answer? what do you think it is? I got 90m
uh, that's not quite right, can you try solving cos(60) = A/40 for A?
i dont belive its B or D is it A then?
we'll find the answer in a minute, hold on if cos(60) = A/40, then what is A?
not quite... cos(60) = A/40 what happens when you multiply both sides by 40?
A = 40*cos(60)
plug that into your calculator and tell me what you get.
60 * 40 = 2400
sorry im bad at this
cos(60), not 60
look for the cos() button
i got 100
use this calculator and type in 40 * cos(60) http://web2.0calc.com/
much better, lets move on to the next part... |dw:1435784134047:dw|
ok, we can use a different trigonometric ratio, tan(45) = opposite/adjacent = 80/B tan(45) = 1, so 1 = 80/B, so B = 80
Okay so the answer is A than? I think i understand
no, please hold on...
|dw:1435784284536:dw| going back to the original diagram, the distance across the wall is A + B A = 20 B = 80 so what is A + B?
thank you so much you made my day <3
Actually, you would subtract A (80) and B (20) to get 60 as your true answer. I just took the test and got that right.