# Two opposite sides of a parallelogram each have a length of #9 #. If one corner of the parallelogram has an angle of #(2 pi)/3 # and the parallelogram's area is #18 #, how long are the other two sides?

##### 1 Answer

Jul 8, 2017

#### Answer:

#### Explanation:

If the whole area is made of two equal triangles, and has an area of 18 in total, then the area of one triangle is

Area of a triangle

In this case,