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h=86,6cm
a=? podstawa
z tw. Pitagorasa
(1/2a)^2=b^2-h^2
(1/2a)^2=100^2-86,6^2
(1/2a)^2=10000-7499,56
(1/2a)^2=2500,44
1/2a=V2500,44
1/2a=50,0044
a=2*50,0044
a=100,0088cm
a=100cm
a=b trójkat równoboczny