# Infinitesimals equivalents

LCSphysicist
Homework Statement:
Is equivalent the infinitesimal segment and the semicircle with diameter equal to this infinitesimal segment?
Relevant Equations:
l/(lpi/2)
dl = Infinitesimal length of the segment.
dlπ/2 = the semicircle length

lim dl-> zero
dl/(dlπ/2) = 2/π, no zero, so the answer would be yes.

But second the book, the answer is no, where am i wrong?