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4=a√2
a=2√2
P=a²
P=(2√2)²=8cm²
b)P=50cm²
a²=50
a=√50 a=5√2
d=a√2
d=5√2*√2
d=10
P=1/2d²
d=4cm
P=1/2*(4cm)²=1/2*16cm²=8cm²
b)
P=1/2d² /*2
2P=d²
d=√2P
d=√2*50cm²=√100cm²=10cm