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Using 3.14 as Pi the area of circle is: 0.5024000000000001

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Area of circle: pi*0.4 squared = 0.503 square meters rounded to 3 decimal places

Q: What is the area of a circle with a radius of 0.4 meter?

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First convert 4% to a decimal (.04) then multiply it by 1 meter: .04 * 1 = .04 metres Other ways of saying this include: 0.4 decimetres 4 centimetres 40 millimetres

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The area is measured in square units, while the circumference is measured in linear units. The two are not directly comparable. It does not make sense to compare different kinds of units, for example, which is larger: a foot or a gallon? If you just want to compare the numerical values while ignoring the units, you get different results for the same circle depending on the units of measurement you choose. The formula for the area of a circle is pi x r2. The formula for the circumference of a circle is pi x 2 x r. So, for example, if the radius is 2 cm, the area is 4 pi cm2 and the circumference is 4 pi cm, they are equal numerically. But 2 cm is the same thing as .02 m. If we use .02 m instead, we get the area is .0004 pi m2 and the circumference is .04 pi m. The circumference is numerically larger. The above example shows why it does not make sense to compare area to circumference. You get a different answer for the same circle depending on what unit of measurement you use.

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0.04 meter 1 meter = 1000 millimeters 1 millimeter = 0.001 meter