A Ruler
The length of the edge of a circle.
A segment is part of a circle created by drawing a line from a point on the edge to another point on the edge.
A straight edge or a ruler are used to construct straight lines.
The length of a math book can be defined in two ways: the physical length of the book or the number of pages contained in the book. In the first case, the length of the book would usually be considered the distance from the top edge to the bottom edge of the book and this would vary depending on the specific book you were considering. In the second case, you could open the book to the last page and examine the final page number and use that as the number of pages.
You do not have to do anything!
Actually it really is called an edge!
A Ruler
The length of the edge of a circle.
A ruler has markings, a straight edge does not. In "straight edge and compass" constructions, you are not allowed to mark the straight edge. Things that are impossible using only a straight edge and compass are possible if markings are allowed (for example, it's possible to trisect an angle using a marked straight edge).
An edge is an area of a 3D figure where two faces meet to form a line segment.
A perpendicular edge is a side of a plane shape that is at right angles (90 degrees) to another edge.
The line round the edge of the circle.
A segment is part of a circle created by drawing a line from a point on the edge to another point on the edge.
Generally a ruler is a straight edge, but it can be anything... I generally just use a spare pencil.
ask ur math teacher ;)
A straight edge is basically another name for a ruler, or it could be anything that makes straight lines.