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The area becomes 16 times as much as it used to be.

Q: What happens to area of a circle if radius quadruples?

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The area quadruples.

It quadruples.

Nothing - if you double the radius you will get the diameter. The area of the circle will remain the same

the surface area quadruples.

As the area of a circle is pi*radius2 the increase in area is a factor of 32. So tripling the radius gives an increase in area by a factor of 9.

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It quadruples.

The area quadruples.

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).

It quadruples.

the area of the circle is increased by 400%

Nothing - if you double the radius you will get the diameter. The area of the circle will remain the same

The circle becomes an oval

the area of the circle will be 1/4 of its original area

the surface area quadruples.

When you triple the radius of the circle . . . -- The diameter also triples. -- The circumference also triples. -- The area is multiplied by 9 .

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.

As the area of a circle is pi*radius2 the increase in area is a factor of 32. So tripling the radius gives an increase in area by a factor of 9.