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a=2√5
ob=4*2√5= 8√5
b. 25=a*a+a*a
2*a*a=25
a=5/√2
p=(5/√2)²=25/2=12,5
c.p=1/2*2*√2*4*√3=4*√6
a=√20
a=2√5
obw= 4× 2√5=8√5