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The circumference of a circle is 2 * pi * r.

If you multiple r by x you get 2 * pi * (r * x) which is the same as x * (2 * pi * r).

So the circumference is multiplied by x.

The area of a circle is pi * r2.

Multiply r by x and you get pi * (rx)2 which is the same is (pi * r2) * x2.

So the area gets multiplied by x2.

Q: What happens to circumferences and areas when the radius of circle is multiplied by some number x?

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it become and even number

When any number is multiplied by its reciprocal, the product is ' 1 '.

If you multiplied a number by 4, then the cube of the number would be increased by a factor of 16.

The inequality is "flipped" when multiplied by a negative number. For example, if x > y and a is a negative number, then ax < ay.

If the length and width of a rectangle are multiplied by the same number, then . . . -- the perimeter is multiplied by the same number -- the area is multiplied by the square of the numbner

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it become and even number

When any number is multiplied by its reciprocal, the product is ' 1 '.

If you multiplied a number by 4, then the cube of the number would be increased by a factor of 16.

The inequality is "flipped" when multiplied by a negative number. For example, if x > y and a is a negative number, then ax < ay.

The answer depends on the fraction.

If the length and width of a rectangle are multiplied by the same number, then . . . -- the perimeter is multiplied by the same number -- the area is multiplied by the square of the numbner

3.14 (pi) multiplied by the diameter of the circle. So if the circle measures 6 inches across the entire width of the circle, that would be the number to begin with.

Any number multiplied by zero = 0

It increases the value.

It decreases.

The number is multiplied by 1000.

The measure around a circle is called a circumference, rather than a perimeter. The term "perimeter" is used for polygons. The circumference of a circle is equal to the diameter, multiplied by pi - or to the radius, multiplied by 2 x pi. The number pi - which can be defined precisely as the ratio between the circumference and the diameter of a circle - is approximately 3.1416.