Ineed to find the missing side to this shape. (file attached)

Draw a line parallel to distance between two buildings

then we get triangle in which side are

Hypotenuse=15

opposite=20-8

=12

adjacent=?

by Pythagoras,

(hypotenuse)²=(Opposite)²+(adjacent)²

15²=12²+adj²

225-144=adj²

81=adj²

9=adjacent

so the distance between two buildings is 9ft

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

the function makes a strait line horizontally with no x intercept but a y intercept at 9.