Hey there! :D
All angles in a triangle equal 180 degrees. An exterior angle is supplementary to the interior angle next to it. (also equal to 180 degrees)
92+24+<B= 180
116+<B= 180
Subtract 116 on both sides.
<B= 64
So,
180-64= 116
The exterior angle of <B is equal to 116 degrees.
I hope this helps!
~kaikers