Answer
$$25 \times 10^3\ mm^2. $$
Work Step by Step
Since $1 cm =10 mm$, we have
$$250 \ cm^2 = 250 \times 10^2 \ mm^2=25 \times 10^3\ mm^2. $$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 3 - Review - Page 157: 20
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