In this diagram, how many points are coplanar with points a, b and r? i was told it was 6, and i chose 2 and got it wrong. can someone explain? answer choices are: 1, 2, 4, 6.

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