Aseamstress 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

(A)

Step-by-step explanation:

It is given that the pillow is in the shape of a triangle with vertices (7, 7) (10, 3) (7, 3).

Let A=(7,7), B=(10,3) and C=(7,3), then using the distance formula, we get

AB=

AB=

AB=

Also, BC=

BC=

BC=

and CA=

CA=

CA=

Now, area of triangle=

=

=

Thus, of fabric she will need if each unit on the grid is one inch.

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two