Question

圆内所有弦长的总长度该如何计算?

Answer 1

8[√(50^2-40^2)+√(50^2-30^2)+√(50^2-20^2)+√(50^2-10^2)]+200

=8[30+40+10(√21+√23)]+200

=760+80(√21+√23)

=760+80(4.583+4.796)

=1527