The length of segment Mn is 2 cm, and point P is the golden section point of segment Mn

With the golden section law, we can get pN / Mn = MP / PN;
Because Mn = 2; MP = 2-PN;
So pN / Mn = MP / PN can be transformed into pN / 2 = (2-PN) / PN
We can get PN = √ 5-1; PM = 2 - (√ 5-1) = 3 - √ 5
I don't know if you can understand it

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