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a) Trapez.
P = 24 cm²
b = 6 cm
h = 3 cm
P=(a+b)h/2
24=(a+6)3/2
48=(a+6)3/:3
16=a+6
a=10
b) Trapez.
P = 36 cm²
h = 4 cm
P=(a+b)h/2
36=(a+b)4/2
18=a+b
c) Równoległobok:
P: 18 cm²
ha = 3,6 cm
hb = 3 cm
P=a*ha
18=a*3,6
a=5cm
P=b*hb
18=b*3
b=6cm
P = 24 cm²
b = 6 cm
h = 3 cm
P=(a+b)h/2
2P = (a+b)h
2P = ah + bh
ah = 2P-bh
a = (2P - bh)/h = 48-18 / 3 = 10cm
b) Trapez
P = 36 cm²
h = 4 cm
P=(a+b)h/2
2P = (a+b)h
(a+b) = 2P/h = 18cm
c) Równoległobok:
P = 18 cm²
ha = 3,6 cm
hb = 3 cm
P=a*ha
18=a*3,6
a=5cm
P=b*hb
b = P/hb = 6cm