20 POINTS FOR THIS GUYS

Of four points are collinear, they are also coplanar

How do i do this activity, is appreciated

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30