Hello!
As you can see, the opposite side of this angle divided by the hypotenuse is 0.91. To find B, we could multiply by the arcsine using a scientific calculator.
sin(0.91)≈65.5
Now, we need to convert this into radians. To do so, we multiply by pi divided by 180.
≈1.14
Therefore, angle B will form an arc of about 1.14 radians.
I hope this helps!