4 years ago

Need help on question 12&13

Mathematics

1 answer:

sammy [17]4 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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