Răspuns:
Explicație pas cu pas:
a) 4,(3) cm;
4,(3) = (43-4)/9 = 39/9 = 13/3
A = (13/3)² = 169/9 = 18,(7) cm²
b) 2.(5) cm;
2,(5) = (25-2)/9 = 23/9
A = (23/9)² = 529/81 = 6,(530864197) cm²
c)radical 8,7 cm;
A = (√8,7)² = 8,7 cm²
d)radical 3.(7)cm.
3,(7) = (37-3)/9 = 34/9
A = (√34/9)² = 34/9 = 3.(7) cm²