Find the measure of the arc or angle indicated?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

True or false look at the picture pls : /

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.