Question

what is the value of b? 140° b

Explanation:

Step1: Recall linear - angle property

The sum of angles on a straight - line is 180°.

Step2: Set up the equation

Let the given angle be 140° and the unknown angle be \(b\). So, \(140^{\circ}+b = 180^{\circ}\).

Step3: Solve for \(b\)

Subtract 140° from both sides of the equation: \(b=180^{\circ}- 140^{\circ}\).

Answer:

40