Answer
Third angle $= 40°$
Work Step by Step
Let us call the missing angle $x$.
The sum of the internal angles in any triangle must be equal to 180°.
Thus, we can write:
$78°+62°+x=180°$
Solving for $x$ gives:
$x=180°-78°-62°=40°$
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 12.3 - Triangles - Exercise - Page 401: 50
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