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Help me please on this IXL

Help me please on this IXL-example-1

1 Answer

7 votes

Answer:

61

Explanation:

Using the exterior angle theorem,


c-15+c-18=c+28 \\ \\ 2c-33=c+28 \\ \\ c-33=28 \\ \\ c=61

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User Djentleman
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