hey guys, this is a precalculus question: Use the given information to determine the area of each triangle.

Two of the sides are 5cm and 7cm. The angle between those sides is 120 degrees. Find the area.

i have 1/2 (5)(7)sin(120), I got 15.55. but is it the right answer? or how can i make it a fraction like the ones i see in the book. and no there are no examples in the book of this.

Question

hey guys, this is a precalculus question:  Use the given information to determine the area of each triangle.  

Two of the sides are 5cm and 7cm. The angle between those sides is 120 degrees. Find the area.


i have 1/2 (5)(7)sin(120), I got 15.55. but is it the right answer? or how can i make it a fraction like the ones i see in the book. and no there are no examples in the book of this.

anonymous · Answer

You can express sin(120) as sqrt(3)/2

lilsis76 · Answer

|dw:1349051003581:dw|

lilsis76 · Answer

why and how would you express it as |dw:1349051133944:dw|