If the central angle of a circle opposite to an arc of six sects is 60 degrees, the radius of the circle opposite to the arc is 60 degrees

If the central angle of a circle opposite to an arc of six sects is 60 degrees, the radius of the circle opposite to the arc is 60 degrees

weiweideshangg
Let R be the radius of the circle to which this arc is directed
(60/360)×2πr=6π
(1/3)πr=6π
r=6π/(1/3)π
r=18
A: the radius of the circle opposite this arc is 18

Know arc length and chord length, find radius, arc length 50, chord length 45, find radius?

Arc length C = 50, chord length L = 45, radius r?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=30
R1=31.554
R2=31.775
R3=31.779
R4=31.779
R=31.779