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Luv2Teach
The sin ratio is the side opposite the reference angle over the hypotenuse.  If Z is our reference angle, then the side opposite it has a length of 32.  The hypotenuse has a length of 40.  Therefore, the sin of Z = 32/40.  We will reduce that to sin Z = 4/5.  First choice above.
For Sinz you have to do
[tex] \frac{32}{40} [/tex]
so answer is
[tex] \frac{4}{5} [/tex]
i think and what is your school level?

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