GB-28-02-001 · Parallel-line angles

Diagram not accurately drawn

Lines ℓ and m are parallel. The marked angles lie between the lines on the same side of the transversal. Find x. Give a reason.

Angles in Parallel Lines: Co-Interior (C) Angles Booklet p. 73

Method

Write each calculation beside the geometric reason that justifies it

Worked Example (GB-28-02-001)

Maths	Reason
$x=180^\circ-46^\circ=134^\circ$	Co-interior angles between parallel lines sum to 180°.

Ans = 134°