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The formula of arc length is like a bow with a height of 2 meters. A string with a length of 23 meters is used to calculate the length of the bow.
Solution: let the arc radius be R.

Half chord length is 23/2 =11.5m.

pythagorean theorem

1 1.5? +(r-2)？ =r？

132.25+r？ -4r+4=r？

4r= 136.25

R = 34.0625m

The central angle is α.

sin(a/2)= 1 1.5/34.0625

a=2arc0.3376

Bow length =ra=68. 125arc0.3376

Here arc0.3376 radian value

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