What Comes Next? (Video 3 of 7)

Start 13:23, length 3 min 27 sec

A second student (Miss Kamoda) explains the formula again, using the example on the board to show where she obtained the radius and half the circumference.

Later, a third student (Iijima; 16:50) uses prior knowledge to show how the formula can be converted to radius x pi x radius.

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