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Answer:
1. The radius is one-half the diameter or the diameter is twice the length of the radius.
2.?
3.Circles are all similar, and "the circumference divided by the diameter" produces the same value regardless of their radius. This value is the ratio of the circumference of a circle to its diameter and is called π (Pi).
Step-by-step explanation:
sorry po di ko po alam sagot sa 2 sorry po talaga pa brainliest naman po