While determining the radius of a circular pond

MATHEMATICS · Subjective · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

While determining the radius of a circular pond, the equation

r^{2} - 25r = 0

was obtained, giving the roots

r = 0

and

r = 25

. State which value of

r

is acceptable and explain why the other value must be rejected.