A seamstress is making a decorative pillow and wants to cover both sides of the pillow with special fabric. The pillow is in the shape of a triangle with vertices (7, 7) (10, 3) (7, 3). How many square inches of fabric will she need if each unit on the grid is one inch? a. 15 inb. 2 7 inc. 2 12 in d. 2 6 in 2