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saul85 [17]
3 years ago
6

11. Sum of angle measures: 180°

Mathematics
1 answer:
shusha [124]3 years ago
7 0

Answer:

given \: tha \: sum \: is = 180 \\ then \\ n + 4n + 40 = 180 \\ 5n + 40 = 180 \\ 5n = 180 - 40 \\ 5n = 140 \\ n =  \frac{140}{5}  = 28 \\ n = 28 \\ thank \: you

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