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Several basic mathematical training
1. circle, (6.28/3.14/2) 2 * 3.14 = 3.14cm2.

Square (6.28/4) 2 = 2.4649 square centimeters.

3. 14-2.4649=0.675 1cm^2

A: The difference is 0.6751cm 22.

2. Minute pass:15 * 2 * 3.14 = 94.2cm..

Minute hand area:15 *15 * 3.14 = 706.5cm2.

Clockwise:12 * 2 * 3.14 = 75.36cm.

Hour hand area:12 *12 * 3.14 = 452.16.

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