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Svetllana [295]
3 years ago
13

Need help on question 12&13

Mathematics
1 answer:
sammy [17]3 years ago
8 0
12.
\alpha=\dfrac{360}{n}\\
18=\dfrac{360}{n}\\
n=20

13.
\dfrac{4}{10}=0.4\\\\
1-0.1-0.4=\boxed{0.5}
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