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Siendo:
B:Base
H:Altura
A:Area o superficie
Ademas:B=H y A=12.5cm²
↓ ↓
3 3
B×B/2=A
AUMENTA EN 2,ENTONCES:
(B+2)²×(B+2)²/2=12,5cm²
(B+2)²/2=12,5cm²
(B+2)²=25cm²
B+2=5cm
B=3cm