Select the postulate that proves this fact. if g and h are different points in plane r, then a third point exists in r not on gh postulate 1: a line contains at least two points. postulate 1a: a plane contains at least three points not all on one line. postulate 1b: space contains at least four points not all on one plane. postulate 2: through any two different points, exactly one line exists. postulate 3: through any three points that are not one line, exactly one plane exists. postulate 4: if two points lie in a plane, the line containing them lies in that plane. postulate 5: if two planes intersect, then their intersection is a line.

Step-by-step explanation:

Postualte 1a is the one we use to prove the fact showed, because based on this postulate a plane must have at least three points to exist. That means we cannot draw a plane with just two points, because the figure formed would be a line.

Remember, you always need three points to draw a plane, and only two point to draw a line.

Therefore, the right answer is the second choice, Postulate 1a.

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find the upper bound of the range.

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step-by-step explanation:

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step-by-step explanation: