plb2007
27.03.2020 •
Mathematics
If Tanya starts at one vertex of the pentagon and walks
all the way around the garden, how far has she walked
in total?
Solved
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Ответ:
AD = 9x + 3
DC = 57
ADC is a line, which is perpendicularly bisected by BD.
Thus AD = DC
9x + 3 = 57
9x = 57 – 3
9x = 54
x = 54/9
x = 6