2 years ago

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Mathematics

1 answer:

Fantom [35]2 years ago

8 0

Answer:

Step-by-step explanation:

$m\angle ABZ+m\angle ZBC=m\angle ABC \\ \\ 12x+55=16x+15 \\ \\ 4x=40 \\ \\ x=10 \\ \\ \therefore m\angle ABZ=120^{\circ}$

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