The answer depends on what the 20 cm refers to.
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If the diameter of a circle 20 cm is tripled the area will increase from 314.2 cm2 to 2,827 cm2
20 cm
The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).
The Lateral Area of a cylinder with diameter of 12 cm and a height of 20 cm is equivalent to 0.075 square meter. Diameter of 12 cm is equals to 0.06 meter in radius and height of 20cm is equals to 0.2 meter
A sphere with a diameter of 20 cm has a volume of 4,188.79 cm3