When two lines intersect each other at one point and the angles opposite to each other are formed with the help of that two intersected lines, then the angles are called vertically opposite angles. All rights reserved. Question 5 : The sum of the two two adjacent angles is 130 °. Source(s): https://shrinks.im/a8B6w. e + b = 180º. CallUrl('www>numbernut>comshtml',0), The octahedron gives rise to a strongly regular graph, because adjacent vertices always have two common neighbors, and ~TildeLink() vertices have four.The Archimedean solids give rise to regular graphs: 7 of the Archimedean solids are of degree 3, 4 of degree 4, and the remaining 2 are chiral pairs of degree 5. Parallel Lines. 9x = 171. x = 19. CallUrl('www>varsitytutors>comhtml',1), A line segment connecting two ~TildeLink() vertices of a polygon.The Complete K-5 Math Learning Program Built for Your ChildParents, Get Started for Free ... CallUrl('www>splashmath>comtutorvista>comhtml',1), diagonal: line segment extending from one of the vertices of a polygon to a ~TildeLink(), vertex diameter: a line segment whose two endpoints lie on a circle and which pass through the center of the circleE ... CallUrl('hawaii>hawaii>edu