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c² = 4²+8²
c² = 16+64
c² = 80
c = √80 = 4√5
P = a*b/2
P = 4*8/2
P = 16
P = c*h/2
2P = c*h
h = 2P/c
h = 2*16/4√5
h = 8/√5
h = 8√5/5
c*c=4*4+8*8
c*c=80
c=pierwiastek z 80 =4 pierwiastki z 5
P=1/2*c*h
16=1/2 *4 pierw.5*h
h=8/pierw.5
h=8*pierw.5/5