Peter (P) and Jamie (j) have computer factories that are 132 miles apart. They both ship their completed computer parts to Diane(d) . Diane is 72 miles from peter and 84 miles from jamie. using points d,j,and p to form a triangle, fine pdj to the nearest ten minutes or nearest tenth of a degree.

what is cos132?

Question

Peter (P) and Jamie (j) have computer factories that are 132 miles apart. They both ship their completed computer parts to Diane(d) . Diane is 72 miles from peter and 84 miles from jamie. using points d,j,and p to form a triangle, fine pdj to the nearest ten minutes or nearest tenth of a degree.

what is cos132?

anonymous · Answer

-.669

amistre64 · Answer

-.669 dosnt look to be a correct answer :)

amistre64 · Answer

maybe for cos132, but that seems spurious at best

anonymous · Answer

Person ask what cos 132 is, so I answer cos 132

amistre64 · Answer

yeah, i see that :)  but i think the cos132 might be wrong for the solution...gonna need to verify it

amistre64 · Answer

we can modify the law of cosines to find the angle they are looking for

amistre64 · Answer

132^2 = 84^2 + 72^2 -2(84)(72) cos(t); solve for t

amistre64 · Answer

132^2 - 84^2 -72^2
------------------- = cos(t)
        -2(84)(72)

amistre64 · Answer

the angle asked for is the cos^-1 of that

anonymous · Answer

THAT SO COOL!  :D  What you did with division sign!  :D  I no think taht way!  :D

amistre64 · Answer

(132^2 - 84^2 -72^2)/(-2(84)(72)) = -0.428571429

t = 115.3769....

:)

amistre64 · Answer

i find that way is alot clearer and faster than fighting the editor