Question

angle relationships
m∠cbl = 139°
find m∠1.
(figure with angles at point b: ∠1 between ba and bl, ∠2 between bc and bl, with ba and bc forming a straight line)
m∠1 + m∠2 = □°

Explanation:

Step1: Identify supplementary angles

$\angle 1 + \angle 2 = 180^\circ$

Step2: Note $\angle 2 = m\angle CBL$

$\angle 2 = 139^\circ$

Step3: Solve for $m\angle 1$

$m\angle 1 = 180^\circ - 139^\circ$

Answer:

$\angle 1 + \angle 2 = 180^\circ$
$m\angle 1 = 41^\circ$