Tiling by Regular Heptagons

(a) Are you able to tile the plane using these regular heptagons?[br](b) If yes, how many heptagons meet at each vertex? [br]Hint: Drag the [color=#1551b5]blue point[/color] to translate and drag the [color=#0a971e]green point[/color] to rotate each polygon.

Information: Tiling by Regular Heptagons