Definition of Coplanar. Set of points, or lines or line segments or rays or geometrical shapes which lie on the same plane are said to be co-planar. In the above diagram, we can see that two planes intersect ( meet ) along a line. The points A and B are on one plane and the points M and N are another plane.
A4 paper is the size most used in the world. The dimensions of A4 is 297 x 210 mm or 11.69 x 8.27 inches. It has an area of 0.062 mÂ², which corresponds to 0.07 square yards, 0.65 square foot, or 93 square inches.When usual and recommended printing margins are put, the printable size of A4 is 247 x 170 mm.he dimensions of A4 is 297 x 210 mm or 11.69 x 8.27 inches. It has an area of 0.062 mÂ², which corresponds to 0.07 square yards, 0.65 square foot, or 93 square inches. When usual and recommended printing margins are put, the printable size of A4 is 247 x 170 mm.
If you use an A6 paper, which is actually an A4 paper that is folded twice, then the matching envelope format should be a C6 envelope. A C6 paper format should be matched with a B6 size envelope (125 mm x 176 mm) while a C5 paper should be matched with a B5 size envelope (176 mm x 250 mm). A C4 size paper should be matched with a B4 format envelope (250 mm x 353 mm). Finally, a B4 size paper should be matched with an E3 size envelope (280 mm x 400 mm). There is a different standard that is in use in North America. However, it should be noted that not all envelope sizes are used for sending mail.