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2Pw=α*R²π/360
3,h=a√3/2
R=2/3 * a√3/2
R=a√3/3
4.h=a√3/2
P=a*a√3/2*2
P=a²√3/4
5.d=a√2
R=a√2/2
6. x=a/2
y=a√3/2