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P=1/2ah
P=1/2*3*4
P=6
6=1/2*h*5
6=2,5h |: 2,5
h=2,4
b)
P=1/2*5*9
P=22,5
22,5=1/2*b*7
22,5=3,5b |: 3,5
b=22½:3½
b=45/2*2/7
b=45/7
b=6 3/7
c)
P=1/2*3*5
P=7,5
7,5=1/2*c*2
c=7,5 (1/2 i 2 skrócą się do 1)