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a=4cm
b=6cm
c=√4²+6²
c=√16+36
c=√52
c=2√13cm
obwód=4+6+2√13=10+2√13=2(5+√13)cm
pole=½ab=½×4×6=12cm²
zadanie 3.
p=a²√3/4
a²√3/4= 36√3 /*4
a²√3= 144√3
a²= 144
a=12 cm
h=a√3/2
h=12√3/2
h=6√3