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Fie ABCD un dreptunghi
a) Daca AB=15,6cm si BC=10cm, calculati aria ABCD
b) Daca aria ABCD = 432,5 cm patrati, AB=17,3 cm. Calc BC
c) Daca aria ABCD=225 cm patrati, AB=12,5 cm Calc BC
d) Daca AB = 24 cm si BC = 15 cm Calc aria ABCD
e) Daca BC=7,5 cm si aria ABCD = 93,75 cm patrati Calc AB

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Răspuns :

a)A =L×l => A=15,6×10 => A =156 cm2
b)A=L×l => 432,5=17,3×BC =>BC=432,5÷17,3=25 cm
c)A=L×l => 225=12,5×BC => BC=225÷12,5 =18 cm
d)A=L×l =>A=24×15 =>A=360 cm2
e)A=L×l =>93,75= AB×7,5=>AB=93,75÷7,5=12,5

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