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p=13cm*13cm*0,5=0,5*169cm²=84,5cm²
a√2=13cm /:√2
a=13cm:√2
a=13√2cm:2
a=6,5√2cm
P=6,5√2cm*6,5√2cm=84,5cm²
P=13²*0.5=169cm²*0.5=84.5cm²