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boyakko [2]
3 years ago
7

Plz help with this problem I need to find the length of CB???

Mathematics
2 answers:
miss Akunina [59]3 years ago
5 0
tan(30)=0.57735026919 \\ 0.57735026919=  \frac{x}{20}
Multiply by 20 on both sides
0.57735026919*20= \frac{x}{20} *20 \\ 11.5470053838=x \\ 11.5=x
and x = side CA
Next you now know the hypotenuse of the other "triangle"
It's Adjacent and hypotenuse
So that's cos
cos(60)= \frac{x}{11.5} \\ 0.5= \frac{x}{11.5}
multiply by 11.5 on both sides
0.5*11.5= \frac{x}{11.5} * 11.5 \\ 5.75 = x
x= side CB
CB=5.75m
dezoksy [38]3 years ago
4 0
CB is equal to 10m  you can tell this bye the side DC being 20 m and the angle of DC is half of CB so that means that CB has to be 10 m
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