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r=1/2a
r=√3/2
R=d/2
d=a√2
R=√3*√2/2
R=√6/2
Po=πR²
Pw=πr²
Po-Pw =πR² -πr² =π(R²-r²)
Po-Pw=π[(√6/2)² -(√3/2)²] =π(6/4 -3/4)
Po -Pw =3/4 π