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Q: If the radius of a circle is doubled the how does that effect the area?

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300. (Doubling the radius multiplies the area by four times.)

A=pir2 a=pi2r2 a=pi4 r2 a increases by 4 times

It quadruples. The area of a circle is Pi (about 3.14159) times the radius squared. So if you double the radius (say from 2m to 4m), you area will change from 4*Pi to 16*Pi (4 times what it was originally).

The area of a circle if the radius is 9m 254.5m2

The radius of a circle with the area of 36 is 3.385

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the radius is from the center of the circle to the edge so that's how you find the radius.

the area of the circle is increased by 400%

It quadruples.

The area quadruples.

The area increases as the square of the radius (or diameter). So if you double the radius you * 4 (quadruple) the area. Treble the radius, you *9 the area.

300. (Doubling the radius multiplies the area by four times.)

As the area of a circle A equals pi times the radius squared, and doubling the diameter means multiplying the radius by four, the area is multiplied by 16 when you double the diameter.

The volume is Base x height; the Base area is the same as the formula for a circle - which is proportional to the square of the radius. For example, if you double the radius (or the diameter, or the circumference) of a circle, its area will quadruple.

A=pir2 a=pi2r2 a=pi4 r2 a increases by 4 times

It quadruples. The area of a circle is Pi (about 3.14159) times the radius squared. So if you double the radius (say from 2m to 4m), you area will change from 4*Pi to 16*Pi (4 times what it was originally).

Area of circle can be computed using formula is A = πr2 , where, A = represented is Area of circle, π = its constant, call it as pie and value is 22/7 i.e 3.142, r = Radius of circle, which has to be squared or doubled to get area of circle.

The area of a circle if the radius is 9m 254.5m2

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