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TheCppZoo · Answer 1 · 2023-07-26T06:16:41+0000

We have the following:

two angles are supplementary when the sum of these is equal to 180 degrees,

now

$\begin{gathered} 13.<\text{FBC}\rightarrow16.[tex]\begin{gathered} <\text{DBC}=<\text{ABC-}<\text{ABD} \\ <\text{DBC}=180-30 \\ <\text{DBC}=150 \end{gathered}$

Therefore, 17.

$\begin{gathered} <\text{ABF}=<\text{ABC-}<\text{FBC} \\ <\text{ABF}=180-40 \\ <\text{ABF}=140 \end{gathered}$

Therefore,

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