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(√2+√4,5)*(√2+√4,5)=(√2)² + 2 * √2 * √4,5 + (√4,5)²=2 + 2 * √9 + 4,5 = 2 + 2 * 3 + 4,5 = 2+6+4,5=12,5 cm²
(√2+√4.5)²=2+2*√2+√4,5+4.5=6.5+2√2+√4.5
odp : 6.5+2√2+√4,5
nie jestem pewna ;)