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?

6 in2
7 in2
15 in2
12 in2

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

One that half its volume

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