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P=πr²
l=2πr
r=1/2a
r=1/2*2=1
l=2*1π=2πcm
P=π1²=πcm²
b)
r=1/2d
d=a√2
d=2√2
r=2√2/2=√2
P=π√2²=2πcm²
l=2√2πcm