Technical drawing

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Geometry: science that studies the relationships and properties of geometric elements (the main ones are: Point, line and plane) in the plane and space.
Plane geometry: part of geometry that studies the relationships and properties of the geometric planes.
Descriptive geometry: part of geometry that studies the systems of representation.
Representation systems: A set of elements that are used to represent space figures in the plane and another return them to their original position.
Point: the intersection of two lines.
Line: is the intersection of two planes.
Plano: geometric element defined by
1, three points.
2 nd two lines that intersect or parallel.
3 º a line and a point / 3 points.
Polygon: A closed plane figure formed by a number of sides and angles. (Regular polygon: sides and angles equal) (irregular polygon: sides and angles unequal)
Locus: one in which all elements satisfy the same condition.
Circumference: is the locus of points equidistant from the center plane. / Flat closed curve formed by infinite points which are equidistant from the center.
Straight-line infinite sequence of points in the same direction.
Curved line: infinite sequence of points in a different direction.
Segment: a straight portion between two points.
Mediatrix: locus of points on the plane that are equidistant from the ends of a segment / line that divides a segment into two equal parts
Angle: flat portion between two straight lines intersect. / Aperture formed two lines to cut.
Bisector: locus of points in the plane equidistant from two lines intersect. / Line that divides an angle into two equal parts.
Central angle: angle formed by two rays which are cut from a circle cut.
Interior angle: angle formed by two chords of a circle cut.
Exterior angle: angle formed by two tangents of a circle cut.
Diameter of a circle is a segment that divides a circle into two equal parts.
Radius of a circle: segment from the center to any point on the circumference.
Rope: Segment joining two points on the circle.
Tangent: it is said that a line or a circle is tangent to another when they touch at one point.
Drying is said that a line or a circle is drying to another when cut in two points.
Link: is the effect of attaching one or two lines with another circle.
Sphere: locus of points in space that are equidistant from the center.
Acute angle: that less than 90 º
Angle: one that measures 90 º
Obtuse angle: one that measures more than 90 º
Obtuse triangle: one that has an obtuse angle.
Equilateral triangle: one that has three equal sides and therefore three equal angles (60 º)
Isosceles triangle: one that has two equal sides and a different one.

Quadrilateral: 4 sided polygon
Parallelogram, quadrilateral parallel-sided pairs.
Square: equal-sided parallelogram / 4-sided regular polygon.
Rectangle ring of parallel sides and equal to two and two equal angles.
Rhombus: a parallelogram with equal sides and angles equal two by two.
Rhomboid: a parallelogram with sides parallel and equal in pairs.
Trapeze: ring two parallel sides and two non-
Isosceles, trapezoid with two equal sides.
Scalene: trapezoid with the four different sides
Rectangle trapezoid with two right angles.
Keystone: the ring of all different sides and not parallel.
Provide: to draw a similar figure with similar dimensions. Make a ratio of two figures.
Ratio: size geometric relationship between two figures.
Apothem of a polygon is a segment connecting the center of the circle with the center side of the polygon.
Oval, flat and closed curve formed by four equal arcs two to two and therefore doubly symmetric.
Oval, flat and closed curve consists of 4 two identical arcs and two different and therefore once symmetrical.
Spirals: plane curve caused by the circular motion of a point to rotate uniformly around a particular nucleus, increasing steadily turning radius.

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