Can someone please help me and show all the work step by step please

asked Mar 6, 2021 77.2k views

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Explanation:

$m\angle {ADC}=134°$

According to the diagram

$\angle {ADB}+\angle{BDC}=\angle{ADC}$

$\longrightarrow\sf 5x+4+7x-2=134$

$\longrightarrow\sf 12x+2=134$

$\longrightarrow\sf 12x=134-2$

$\longrightarrow\sf 12x=132$

$\longrightarrow\sf x=\frac {132}{12}$

$\longrightarrow\sf x=6$

$m\angle{BDC}=7x-2=7×6-2 =40°$

David Pfau answered Mar 12, 2021

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