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?

x=12 units bd= 10 units

step-by-step explanation:

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq