∠A=60°,AA1D1等边三角形,可得A1D1=5∠D=120°,DC1D1等腰三角形,可解得C1D1=5√3A1B1C1D1周长2(5+5√3)=10(√3+1)A2B2C2D2=4*5=20是ABCD的1/4A5B5C5D5=(1/4)(1/4)A1B1C1D1=(5/8)(√3+1)
A1B1C1D1的周长是10(1+√3)A2B2C2D2的周长是10*4/2=20;A5B5C5D5的周长是10(1+√3)/4