Answer
54 diagonals
Work Step by Step
$D = 1/2 * n * (n-3)$
12 sides
$D = 1/2 * n * (n-3)$
$D = 1/2 * 12 * (12-3)$
$D= 6 * 9$
$D=54$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.7 - Quadratic Equations and Problem Solving - Exercise Set - Page 466: 17
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