Angles in a quadrilateral
{"Image DocumentName": "Angles in a quadrilateral", "Image ImageDescription": "Prove that any convex quadrilateral has angles of total measure 360 degrees.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}