seen from Kazakhstan

seen from United States
seen from T1
seen from Canada

seen from United States

seen from United States

seen from United States

seen from United States

seen from Canada

seen from United States

seen from United States
seen from United States
seen from United States

seen from United States
seen from Mexico

seen from United States

seen from Türkiye

seen from United States

seen from United States
seen from United States
SERT!!!
The radian measure of a central angle of a circle is defined as the ratio of the length of the arc the angle subtends, s, divided by the radius of the circle, r.
Can someone tell me if that integral is correct?