Question

(1)1°的圆心角所对弧长为1米,则此圆半径为______________________米;

(2)1 rad的圆心角所对弧长为1米,则此圆半径为______________________米.

Answer 1

解析:(1)∵1°=弧度,∴1=·r.

∴r= (米).

(2)∵l=α·r,∴1=1·r.∴r=1(米).

答案:  1