The measure of m∠8 = 137°  due to corresponding angles are supplementary.
What are supplementary angles?
Supplementary angles are defined as when two angles add up to 180 degrees. Supplementary angles form a straight angle.
∴ m∠2 = m∠6 = 43°  [ Corresponding angles }
Now, line L is a straight line and line T is on it,
∴ m∠6 + m∠8 = 180°  [ Angles in linear pair ]
⇒  43°  + m∠8  = 180°
⇒  m∠8 = 180° - 43°
⇒ m∠8 = 137°
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