Answer
1168.5 $m^{2}$
Work Step by Step
A decagon has ten sides, so the perimeter is 10 x 12.3 = 123
A=$\frac{1}{2}$ap
A=$\frac{1}{2}$(19)(123)
A=1168.5
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 10 - Area - 10-3 Areas of Regular Polygons - Practice and Problem-Solving Exercises - Page 632: 15
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