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# Geometry

### Geometry of Straight Lines

TermDefinition
Gradient of straight line Steepness or slope
General equation of straight line y = mx + c
m Coefficient of x; value of gradient
c Constant term; value of y-intercept
distance between two points The absolute value of the difference of the coordinates of the points.
mid-point a point equidistant from the ends of a line or the extremities of a figure
gradient A difference in concentration, pressure, or electrical charge between two regions.
parallel Phrases or sentences of a similar construction/meaning placed side by side, balancing each other
perpendicular At an angle of 90˚ to a given line, plane, or surface.
y-intercept The Y-coordinate of the point where the line crosses the y-axis. (Y,0)
x-intercept The coordinate at which a graph intersects the x-axis. The X-coordinate of the point where a line crosses the x-axis (X.0)
Straight lines with positive gradient /
Straight lines with negative gradient \
What is a straight line? A straight line is a set of points with no definite starting point or end point
What is a line segment? It is a set of points with a definite start and end point