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Let s denote distance v denote speed t denote time. s = integral(v)dt If speed is constant, s = vt.
G
m stands for "modulus".
Vectors are used to denote or model directions.
Denote the original area by A, denote the new area by A', denote the original circumference by C, and denote the new circumference by C'. C=2*pi*r so C'=2C=2*pi*(2r). So doubling the circumference corresponds to doubling the radius. A=pi*r2. A'/A=pi*(2r)2/[pi*r2]=4. So doubling the radius quadruples the area.