C
A
B
5
9
10
[Graphs generated by this script: initPicture(-1,10,-10,1);line([0,0],[0,-9]);line([0,0],[5,0]);line([5,0],[0,-9]);line([0.6,0],[0.6,-0.6]);line([0,-0.6],[0.6,-0.6]);text([-0.5,0.5],"C");text([0,-9.9],"A");text([5.9,0],"B");text([5.9/2,0.5],"5");text([-0.5,-9.9/2],"9");text([5.9/2,-9.9/2],"10")]
Note: Triangle is not to scale.
In right triangle ABC above, what is the cosine of B?
9
5
\displaystyle \frac{{9}}{{5}}
5
9
10
9
\displaystyle \frac{{10}}{{9}}
9
10
10
5
\displaystyle \frac{{10}}{{5}}
5
10
5
9
\displaystyle \frac{{5}}{{9}}
9
5
9
10
\displaystyle \frac{{9}}{{10}}
10
9
5
10
\displaystyle \frac{{5}}{{10}}
10
5
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