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ha=8
b=10
hb=?
b*hb=a*ha
hb=a*ha/b
hb=13*8/10
ha=10,4
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a=9cm
b=40cm
c=41
hc=?
c*hc/2 =a*b/2
c*hc=ab
hc=ab/c
hc=9*40/41
hc=360/41
hc=8 32/41 cm
hc≈8,78 cm