Copy pq to the line with an endpoint at r.
this task will be complete when you have
drawn an arc intersecting the line to create
a segment with length pq.

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15