Answer
Area = $\frac{1}{2}$* 5*6* sin78°
Work Step by Step
Using theorem 11.4.1
The area of the given triangle is = $\frac{1}{2}$ab sinγ
Given a =5 b=6 and γ = 78°
therefore Area = $\frac{1}{2}$* 5*6* sin78°
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 11 - Section 11.4 - Applications with Acute Triangles - Exercises - Page 527: 1a
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