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dA =
(theta / 2π) (πr²) = (1/2) r² (theta)
A (bounds a, b) =
int (bounds a, b) ( (1/2) f(theta)²) dtheta
dℓ =
dtheta sqrt( (dx/dtheta)² + (dy/dtheta)² )
dx/dtheta =
f’(theta) cos(theta) - f(theta) sin(theta)
dy/dtheta =
f’(theta) sin(theta) + f(theta) cos(theta)
ℓ =
int (bounds theta1, theta2) (sqrt( (f(theta)²+ (f’(theta)²) dtheta )