Incorrect.
Go through the numbers and you'll find un-prime numbers ending in 1:
21, 81, 121,...
Answer:
Divide the central angle in radians by 2 and perform the sine function on it. Divide the chord length by double the result of step 1. This calculation gives you the radius. Multiply the radius by the central angle to get the arc length.
It has already given you the answer.
Answer:
Step-by-step explanation: