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A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its length, it is usually called a ruler . Straightedges are used in the automotive service and machining industry to check the flatness of machined mating surfaces.
Doubling the cube is the construction, using only a straightedge and compass, of the edge of a cube that has twice the volume of a cube with a given edge. This is impossible because the cube root of 2, though algebraic, cannot be computed from integers by addition, subtraction, multiplication, division, and taking square roots.
In geometry, a straight line, usually abbreviated line, is an infinitely long object with no width, depth, or curvature, an idealization of such physical objects as a straightedge, a taut string, or a ray of light. Lines are spaces of dimension one, which may be embedded in spaces of dimension two, three, or higher.
Hardline imagery using two M16 rifles in front of an "X", symbolising the straight edge lifestyle that the movement was branched from. Hardline is a subculture that has its roots in the vegan straight edge hardcore punk scene. [1] It is commonly seen as a more extreme version of straight edge, with influences from deep ecology philosophy.
Straight edge grew out of hardcore punk in the late 1970s and early 1980s and was partly characterized by shouted rather than sung vocals. [16] Straight-edge individuals of this early era often associated with the original punk ideals such as individualism, disdain for work and school, and live-for-the-moment attitudes. [9]
Construction by straight edge and compass. In classical geometry, the bisection is a simple compass and straightedge construction, whose possibility depends on the ability to draw arcs of equal radii and different centers:
In geometry, a line segment is a part of a straight line that is bounded by two distinct endpoints (its extreme points), and contains every point on the line that is between its endpoints. It is a special case of an arc, with zero curvature. The length of a line segment is given by the Euclidean distance between its endpoints.
Perpendicular intersections can happen between two lines (or two line segments), between a line and a plane, and between two planes. Perpendicular is also used as a noun: a perpendicular is a line which is perpendicular to a given line or plane.
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