Răspuns :
l----------l peri }
l----------l---------l--------l--------l meri} 20 suma
1+4=5 segmente
20:5=4 peri
4x4=16 meri
l----------l---------l--------l--------l meri} 20 suma
1+4=5 segmente
20:5=4 peri
4x4=16 meri
meri = a
peri = b
a + b = 20
a = b x 4
--------------
a , b = ?
4b + b = 20
5b = 20
b = 20 : 5
b = 4
a = b x 4
a = 4 x 4
a = 16
peri = b
a + b = 20
a = b x 4
--------------
a , b = ?
4b + b = 20
5b = 20
b = 20 : 5
b = 4
a = b x 4
a = 4 x 4
a = 16