Find the area of the polygon. show your

You have to use composites here since this is not a regular polygon.  It looks like you could split it up into a triangle and a parallelogram.  The area of a triangle is while the area of a parallelogram is A=bh. Find the areas of both those shapes and then add them together.  The triangle has a height of 3 units and a base of 5 units.  Therefore, its area is 15/2.  Now for the parallelogram.  It has a height of 3 units and a base of 5 which is 15.  So we will add those together: , which, with a commond denominator is 45/2 or 22.5 units squared.