A circle of radius 7m has a standard error of 0.02m on the radius. The standard error of its area is

A circle of radius 7m has a standard error of 0.02m on the radius. The standard error of its area is

a) 0.04 m

b) 0.14 m

c) 0.28 m²

d) 0.88 m²

Surveying MCQs Set-2