If the diameter of a circle is 20ft. what is the circumference?

The circumference of this circle would be:

You can round this down however you would like. Hope this helps :)

Step-by-step explanation:

in the picture radius=20 ft

circumference C=2π r=2×3.14×20=125.60 sq. ft.

(0, 6), (4, 4), and (0, -4)

Step-by-step explanation:

basically you pick 2 sides (each with endpoints at two of the three verticies) to be the adjacent sides, and then you can easily find the fourth vertex for each case.