The diameter of a circle is 12 cm. The circumference of the circle is 12 cm______ What is the area______ ． | Math enthusiast | Mathematical art

The diameter of a circle is 12 cm. The circumference of the circle is 12 cm What is the area ．

The diameter of the circle is 12 cm, the radius of the circle is 12 △ 2 = 6 (CM), the circumference of the circle is 3.14 × 12 = 37.68 (CM), and the area of the circle is 3.14 × 62 = 113.04 (square cm). Answer: the circumference of the circle is 37.68 cm, and the area of the circle is 113.04 square cm. So the answer is: 37.68 cm, 113.04 square cm

If the diameter of a circle increases from 2 cm to 4 cm, the circumference of the circle will increase by () cm and the area will increase by () cm

If the diameter of a circle increases from 2 cm to 4 cm, the circumference of the circle will increase by (6.28) cm and the area will increase by (9.42) square cm

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