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1.
a=13cm
b=7cm
P=13*7=91cm2
Obw=2*13+2*7=40cn
2.
a=12cm
b=1dm=10cm
P=12*10=120cm2
Obw=2*12+2*10=44cm
3.
a=8mm
b=?
P=64mm2
8*x=64
x=8
b=8
Obw=4*8mm=32mm
4.
a=?
b=21cm
P=63cm2
21*x=63cm2
21*3=63cm2
a=3
Obw= 3*2+21*2=48cm
5.
a=10m
b=100m
P=10m*100m=1000m=1km
Obw= 2*10+2*100=240m
6.
a=?
b=10cm
Obw=60cm
2*10+2x=60
20+2x=60
2x=60-20
2x=40
x=20
a=20
P=20cm*10cm=30cm2