The distance between the points on the terrain 900m was depicted on the plan with a 3 cm segment of the scale.

To solve this problem, you first need to convert the distance between points from meters to centimeters.

Since 1 meter is 100 centimeters, we get:

900 * 100 = 90,000 cm.

Find the ratio of the distance between points to the length of the line segment on the plan.

We get:

90,000 / 3 = 30,000.

Since the distance ratio was 30,000, the scale of the plan will be 1: 30,000.

Answer: The scale of the plan is 1: 30,000. There are 300 meters in 1 centimeter.

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