Răspuns :
latimea = a
lungimea = 2a
( a+2a) x2 = 36
3a=36:2
3a = 18
a=18:3
a=6
latimea = 6cm
lungimea =12 cm
latimea /----/
} suma = semiperimetrul = 36;2 = 18
lunigmea /----/----/
1+2 = 3 segmente egale
18:3 = 6 un segment egal
latimea = 6cm
lungimea = 12cm
lungimea = 2a
( a+2a) x2 = 36
3a=36:2
3a = 18
a=18:3
a=6
latimea = 6cm
lungimea =12 cm
latimea /----/
} suma = semiperimetrul = 36;2 = 18
lunigmea /----/----/
1+2 = 3 segmente egale
18:3 = 6 un segment egal
latimea = 6cm
lungimea = 12cm