Question

lines m and n are parallel. find the measure of ∠a. m n a m∠a = ?°

Explanation:

Step1: Identify angle relationship

The 51° angle and ∠a are same - side interior angles (or supplementary angles as lines M and N are parallel).

Step2: Use supplementary angle formula

Supplementary angles add up to 180°. So, \(m\angle a=180 - 51\)

Step3: Calculate the value

\(180-51 = 129\)

Answer:

129