Posted by **anonymous** on Friday, April 10, 2009 at 5:40pm.

if 0< theta < 90 and tan theta equals pie3/2, find cos theta.i put 2/pie 7 but i was wrong please correct.

- math -
**Reiny**, Friday, April 10, 2009 at 6:00pm
I don't know what you mean by

pie3/2 and by 2/pie 7

do you mean 3pi/2 ? or ???

2/pie 7 is even more confusing.

remember tan(theta) = opposite/ adjacent

so you can form a right-angled triangle in the first quadrant, fill in those two sides, then use Pythagoras to find the hypotenuse.

And cos(theta) = adjacent/hypotenuse

- math -
**anonymous**, Friday, April 10, 2009 at 6:04pm
my nswers was 2/pi7 but i ws wrong

- math -
**Reiny**, Friday, April 10, 2009 at 6:12pm
you did not answer my question.

What do you mean by 2/pi7 ???

do you mean 2/(7pi) ? or (2/pi)(7) ? or ...

write it as (numerator)/(denominator)

- math -
**anonymous**, Friday, April 10, 2009 at 7:09pm
sorry my nswer was 2/(7 pi) but it ws wrong

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