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a=bok http://zadane.pl/responses/add/593092#
d=przekatna
d=a+2cm
a√2=a+2
a√2-a=2
a(√2-1)=2
a=2:(√2-1)
a=2√2+2
a=2(√2+1)cm= bok kwadratu
b]
z pitagorasa:
a²+(½a)²=(3√5)²
a²+¼a²=45
⁵/₄a²=45
a²=45:⁵/₄
a²=36
a=6= bok kwadratu