ABC and CBD are complementary and mCBD is twice the mABC.
Chapter 9, Problem 9.1.112(choose chapter or problem)
\(\Varangle A B C\) and \(\Varangle C B D\) are complementary and \(m \Varangle C B D\) is twice the \(m \Varangle A B C\). \(\Varangle A B D\) and \(\Varangle D B E\) are supplementary angles.
a) Draw a sketch illustrating \(\Varangle A B C\), \(\Varangle C B D\), and
\(\Varangle D B E\).
b) Determine \(m \Varangle A B C\).
c) Determine \(m \Varangle C B D\).
d) Determine \(m \Varangle D B E\).
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