Posted by David on Monday, June 14, 2010 at 8:46pm.
Are we solving for theta ??
if so, then
tan Ø = -8/9 and if cos Ø < 0
Ø must be in quadrant II
angle in standard position is 41.63°
( since tan 41.63° = +.888889 or 8/9 )
so Ø = 180 - 41.63 or 138.37°
check:
tan 138.37 = -.888889
cos 138.37 is negative.
Change your calculator to Radians if you want those units
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