In the equation above S = 4πr², if the value of r is doubled, then the corresponding value of S is multiplied by
When the value of r is doubled, the corresponding value of S is multiplied by 4.
The equation \( S = 4\pi r^2 \) shows that surface area \( S \) is proportional to the square of the radius \( r \). Therefore, if \( r \) is doubled, \( S \) increases by a factor of \( 2^2 = 4 \).
This choice suggests that doubling the radius would reduce the surface area to a quarter of its original value. However, this is incorrect because increasing \( r \) actually increases \( S \), not decreases it. The relationship between \( S \) and \( r \) is quadratic, leading to an increase rather than a decrease.
This option implies that doubling the radius results in the surface area being half of its original size. This is also inaccurate; the surface area increases as the radius increases, and it does not decrease to half. The quadratic relationship ensures that \( S \) grows, not shrinks.
Choosing 2 suggests that the surface area doubles when the radius is doubled. While \( S \) does increase, it actually quadruples due to the squaring effect of the radius in the equation. Thus, this option misrepresents the relationship between \( S \) and \( r \).
This is the correct choice, as it accurately reflects the relationship defined in the equation. Doubling \( r \) leads to \( S \) being multiplied by \( 2^2 = 4 \), demonstrating the quadratic dependence of surface area on radius.
This option indicates that the surface area is increased eightfold when the radius is doubled. However, this is incorrect, as the increase is only by a factor of 4, stemming from the square of the radius change, not a cubic relationship.
The surface area \( S \) of a sphere is directly related to the square of its radius \( r \). Therefore, when \( r \) is doubled, \( S \) is multiplied by 4, illustrating the quadratic nature of the relationship. This understanding is crucial in geometry and physics, where surface area calculations are frequently necessary for applications involving spheres.
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