Answer
$103\ m^2.$
Work Step by Step
The material needed for the balloon is the surface area of the sphere
$A=4\pi r^2=4 \pi (5.72/2)^2=102.78\ m^2\approx 103\ m^2.$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Section 12.10 - Spheres - Exercise - Page 438: 6
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