SOLUTION: find the area of a triangle with sides 23cm, 26cm, 31cm to thee nearest ten cintemeters.

Algebra ->  Triangles -> SOLUTION: find the area of a triangle with sides 23cm, 26cm, 31cm to thee nearest ten cintemeters.       Log On


   

Question 867103: find the area of a triangle with sides 23cm, 26cm, 31cm to thee nearest ten cintemeters.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Pick any vertex you want, and use Law of Cosines to find the angle or the cosine. You can then use sine of the angle with one of the sides of the chosen vertex to find height of the triangle. Now just use area formula of a triangle, %281%2F2%29b%2Ay, in which y is the height. b is base.