Step {{ Math.min(step, 3) }} of 3

Tap two Corresponding Angles

Find a pair of angles that sit in the exact same position at each intersection.

Make the Lines Parallel

Adjust the bottom line. Co-interior (same-side) angles must add up to 180°.

120° + {{ 60 - s2_slider }}° = {{ 180 - s2_slider }}°

Lines are Parallel!

Drag the corresponding angle to prove they are equal, then solve for x.

Angle 1 {{ s3_A * s3_x + s3_B }}°

Value of x {{ s3_x }}

Angle 2 {{ s3_C * s3_x + s3_D }}°

Angles are equal! x = {{ s3_targetX }}

You've conquered parallel lines, transversals, and their special angles.