Answer
$a \approx22.69$, $c \approx23.04$, $A=80^\circ$.
Work Step by Step
Given $b=4, B=10^\circ$, we have $a=b\ cotB=4cot10^\circ\approx22.69$, $c=b\ cscB=4csc10^\circ\approx23.04$, $A=90^\circ-B=80^\circ$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 7 - Applications of Trigonometric Functions - Section 7.1 Right Triangle Trigonometry ; Applications - 7.1 Assess Your Understanding - Page 540: 30
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