A​ penny-farthing is a bicycle with a very large front wheel and a much smaller back wheel.​ Penny-farthings were popular in the 1800s and were available in different sizes. The ratio of the diameter of the front wheel of a​ penny-farthing to the diameter of the back wheel is​ 13:4. What is the ratio of the circumference of the front wheel to the circumference of the back​ wheel? Explain.

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a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

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