Confusing questions Watch

Steve445
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Here:
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Steve445
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Steve445
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I don't know what do do first.
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humphreyseuan19
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180 degrees in a triangle
180-90=90
Two other angles add to 90
4:1 so there are five parts
90/5=18
18*4=72. Angle B
18*1 =18 Angle A

To find BC do trig

Then to find AB do Pythagoras



(Original post by Steve445)
I don't know what do do first.
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mqb2766
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(Original post by humphreyseuan19)
180 degrees in a triangle
180-90=90
Two other angles add to 90
4:1 so there are five parts
90/5=18
18*4=72. Angle B
18*1 =18 Angle A

To find BC do trig

Then to find AB do Pythagoras
No need to find BC, just use trig to find AB directly (after you've worked out the angle)
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Steve445
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Okay, have I done it correct?
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mqb2766
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No, 52 is way too large, just look at the triangle.
In tan, you divide an angle by a length .which is wrong.
Just use
cos(18)
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Steve445
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(Original post by mqb2766)
No, 52 is way too large, just look at the triangle.
In tan, you divide an angle by a length .which is wrong.
Just use
cos(18)
So just using cos(18) will get me the answer, right?
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Lala143
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Share 90 in the ratio 1:4
90/5=18
angle x=18
Use the function Cosine because you want to find the hypotenuse and have the adjacent
Cos(18)=14/h
hypotenuse=14/Cos(18)
I don't have a calculator on me but I think that's what you do
Hope this helped
Last edited by Lala143; 1 week ago
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Lala143
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Just checked on my calculator: it's 14.7204 but in 3 sig. fig. it is 14.7
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