Question

What angle in radians is subtended by an arc 1.50?

Answer 1

I guess that the 1.5 is in radian (that is equivalent to ≈86°)

If the vertex of the angle is on the center of the circle, then the angle 1.5 r or (86°)

If the vertex of the angle is on any point of the circle, then the angle 0.75 r or (43°)