Math & Physics Problems Wikia
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Problem

今有積三百步。問:為圓周幾何?

There is an area of 300 square bu. What is the circumference of the circle?

Circle fields.jpg

Solution

The area of the circle is . Since the circumference of a circle with diameter is ,

.

Therefore

Commentary

The original text provides the answer 60 bu. This answer assumes .

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