One Atta Time Flash Cards Distance Learning Create New Sheet Customize Problems Select a Worksheet > Version 1 Version 2 Version 3 Version 4 Version 5 Version 6 Version 7 Version 8 Version 9 Version 10 Grab 'em All Finding Missing Angles 7g5 Find an unknown angle when you know the other angle in a straight line (they add to 180°).Use vertical angles and adjacent angles in intersecting lines to figure out missing measures.