In fact,

$AB$ and $CD$ are not parallel angle$w$ is 60°

What effect does this have on the size of angle $y$? Tick a box.

Show working to support your answer.

[3]

The diagram shows a regular 10-sided polygon, $ABCDEFGHIJ$

Show that $x=y$.

[4]

$AB,CD$ and $YZ$ are straight lines. All angles are in degrees.

Show that $AB$ is parallel to $CD$.

[4]

The diagram shows a regular octagon $ABCDEFGH$ and a regular pentagon $ABIJK$

Work out the size of the angle$x$.

[4]