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Lubov Fominskaja [6]
3 years ago
11

PLEASE HELP ME PLZ PLZ PLZ

Mathematics
1 answer:
Oksana_A [137]3 years ago
4 0

Answer:

4

Step-by-step explanation:

pythagoras theorem = a* + b* = c* ( by '*' i mean squared)

2* + b* = square root twenty

4 + b* = 20

b* = 16

b = 4

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