the concept of lines and angles r used in our daily life. straight lines are in class rooms on the floor, door,window,zebra crossing on road side. where as angles are used in building constructions,inter connected with subjects like physics chemistry etc.types of angles are used in yoga position , games fields and so on
Railway lines are parallel. 2 lines are said to be parallel when they are contained in the same plane and do not intersect. This is the definition. That parallel lines exist is an assumption (postulate) of Euclidean geometry:Parallel lines are like the rails of a train track, and you might think of defining them this way, as lines that are the same distance apart everywhere. The problem with this kind of definition is it assumes both tracks are straight. Though this seems an obvious possibility, when you go into the vast universe it is not that obvious. Parallel lines puzzled the best mathematicians for centuries until it was realized that we must assume they exist (you can't prove they exist from simpler postulates). The problem with parallel lines lies in the notion that the lines have infinite extent.Euclid used a somewhat different parallel postulate in trying to avoid the notion of the infinite. He observed that when two parallel lines are intersected by a third line, called a transversal, then if you measure two angles formed by these three lines, on the same side of the transversal and between the parallels, they will add to (that is, they will be supplementary). Such angles are called same-side interior angles.Another important concept is perpendicular. By definition, two lines are perpendicular if they intersect at right angles. That is, two perpendicular lines form 4 right angles. Segments and rays can also be perpendicular. This means they intersect in at least one point, and the two lines containing them are perpendicular.We use perpendicular segments to measure the distance from a point to a line, a point to a plane, or the distance between two parallel lines or planes. The ties of a railroad track are perpendicular to the rails and of the same length. This common length is the distance between the rails. (If parallel lines exist, then railroad tracks in space can go on forever.)There are three theorems about perpendicular lines that you should know. We will not attempt to prove them here, but if you think about them they should be rather obvious.We can use this fact to define the distance from a point to a line: That distance is the length of a segment perpendicular to the line with the given point as one of its endpoints and the other endpoint on the line. In fact, a similar notion holds in 3 dimensions. If we have a plane and a point not on that plane, then there is only one line through the point perpendicular to the plane, and the length of the segment determined by that point and the intersection of the perpendicular line with the plane is defined as the distance from the point to.
ughhhi need info too
Measuring a lawn Calculating the speed of a falling object
Extended in the same direction, and in all parts equally distant; as, parallel lines; parallel planes., Having the same direction or tendency; running side by side; being in accordance (with); tending to the same result; -- used with to and with., Continuing a resemblance through many particulars; applicable in all essential parts; like; similar; as, a parallel case; a parallel passage., A line which, throughout its whole extent, is equidistant from another line; a parallel line, a parallel plane, etc., Direction conformable to that of another line,, Conformity continued through many particulars or in all essential points; resemblance; similarity., A comparison made; elaborate tracing of similarity; as, Johnson's parallel between Dryden and Pope., Anything equal to, or resembling, another in all essential particulars; a counterpart., One of the imaginary circles on the surface of the earth, parallel to the equator, marking the latitude; also, the corresponding line on a globe or map., One of a series of long trenches constructed before a besieged fortress, by the besieging force, as a cover for troops supporting the attacking batteries. They are roughly parallel to the line of outer defenses of the fortress., A character consisting of two parallel vertical lines (thus, ) used in the text to direct attention to a similarly marked note in the margin or at the foot of a page., To place or set so as to be parallel; to place so as to be parallel to, or to conform in direction with, something else., Fig.: To make to conform to something else in character, motive, aim, or the like., To equal; to match; to correspond to., To produce or adduce as a parallel., To be parallel; to correspond; to be like.
yes in 1973
parallel lines are used in the white house. The columns holding it up are parallel lines and the floor and the roof of a room are parallel planes as long as they are the same shape
you can coordinate parallel because parallel lines never touch or cross
Lines parallel to the equator.
Corresponding angle are used to prove if lines are parallel. If they are congruent then the lines cut by the transferal are parallel.
They are lines of latitude.
ruler
Well, they are used for graphing information on graphs and are used on maps.
A staff or a stave is the system of parallel lines and spaces used to write music notation.
Set squares are useful for drawing parallel lines and perpendicular lines.
A+
An equilateral triangle, or curved variations which may be used for paving.