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b=21
najlepiej skorzystac ze wzoru na pole
P=1/2ab
lub
P=1/2ch
1/2ab=1/2ch
h=ab/c=ab/√(a²+b²)
c=√(a²+b²)=√(20²+21²)=√(400+441)=29
h=20*21/29=14,48
ODP
h=14,48cm
pozdrawiam