Answer
$\dfrac {s^{2} \sqrt 3}{4}$
Work Step by Step
$A=\dfrac {ab\times\sin \alpha }{2}$
$A=\dfrac {s\times s\times \sin 60^{0}}{2}=\dfrac {s^{2} \sqrt 3}{4}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.3 Trigonometric Functions Values and Angle Measures - 5.3 Exercises - Page 532: 56
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