6th Grade Itinerary Problem Solution Review: Problem 1

Problem: As shown in the figure, points A and B are on either ends of the diameter of a circle. Karen starts from point A and Kalie starts from point B and they start traveling in opposite directions at the same time. The first time they meet is at point C, which is 80 meters from point A. After that they continue moving at the same speeds and their second time meeting is at point D, which is 60 meters from point B. Find the circumference of this circle.

Key: Approach the situation as a whole; Use ratios

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