Question

What angle in radians is subtended by an arc of 1.50 m in length on the circumference of a circle of radius 2.58 m ?

Answer 1

Arc length = r θ
where
r=radius
θ = angle subtended.

Applying relation,
1.5 = 2.58 θ
=>
θ = 1.5 / 2.58 = 25/43 radians (or =0.581 radians, to 3 places of decimal)