Question

If sides A and B of a triangle have lengths of 13 and 2 respectively, and the angle between them is `(3pi)/4`, then what is the area of the triangle?

Answer 1

13 /`sqrt`2 areal units.

Explanation:

Area = A X B X sin ( angle between these sides ) / 2
sin 3`pi`/4 = sin ( `pi` `-` `pi`/4 ) = sin `pi`/4.