Question

椭圆的长轴为1.1m 短轴为1.2m 求椭圆的周长

Answer 1

椭圆周长=2πb+4(a-b),a为长半轴长,b为短半轴长.

题中a=0.6,b=0.55,

∴周长=2π*0.55+4（0.6-0.55）=1.1π+0.2

=1.1*3.14+0.2=3.654