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Pp=a^2
Pp=2^2=4
Pś=ah/2
ah/2=4
h=2*4/2
h=4 wysokośc ściany bocznej
ztw. Pitagorasa
H^2=h^2-(1/2a)^2
H^2=4^2-1
H^2=16-1
H^2=15
H=V15 pierwiastek z 15