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Geometry (Technical Drawing (Circle/Circumference (Circle (It is the…

- - - - It is the surface of the circumference.
    - - The distance around the circle.
    - - The distance across a circle through the center.
    - - It is the distance from the center of a circle to any point on the circle.
    - - A line segment that joins two points on a curve.
    - - A portion of the circumference of a circle.
  - - - It is the point where the three angles bisectors intersect. The incenter is the center of the incircle.
    - - It is the point where the three altitudes intersect. An altitude is a line that goes from the vertex to the opposite side.
    - - It is the point at which the three perpendicular bisectors of the sides of a triangle intersect. The circumcenter is the center of the circumcircle.
    - - It is the point where the three medians intersect. A median is a line that goes from the vertex to the midpoint of the opposite side.
  - - - A tangent is a line in the plane of a circle that intersects the surface of a circle.
    - - The big difference between a tangent and a secant is that a secant touches the circumference at two points and the tangent only at one.
    - - All the constructions follow this rule: the point of tangency is on the radius of the circle, and the tangent line is perpendicular to it.
      - Different constructions
        
        Tangent to a circle at a given point on the circle.
        
        Tangent from a point outside a circle construction.
        
        External tangents to two given circles.
    - - What are the tangent circles?
        
        Tangent circles are two circles that are tangent to the same line at the same point.
      - Externally tangent circles
        
        Two circles are externally tangent if each of the tangent circles lies outside the other.
      - Internally tangent circles
        
        Two circles are internally tangent if one of the tangent circles lies inside the other.
    - - What is an ellipse?
        
        An ellipse is the locus of all points of the plane whose distances to two fixed points add to the same constant.
      - Axis of an ellipse and an ovoid
        
        Major axis
        
        It is the longest diameter of the ellipse. It cuts the ellipse into two equal parts
        
        Minor axis
        
        It is the shortest diameter of the ellipse. It also cuts the ellipse into two equal parts.
      - How to construct an ellipse
        
        You can only construct an ellipse when you have the major axis.
      - What is an ovoid?
        
        It is a closed and plane curve, composed for two circular arc equal and other two unequal, it have a single axis of symmetry.
      - How to construct an ovoid
        
        You can only construct an ovoid when you have the minor axis.
  - - - Thales of Miletus
        
        He was a pre-Socratic Greek philosopher, mathematician and astronomer who explained the world and universe using theories and hypothesis.
      - Thales' Theorem
        
        It says that using paral·lelism we can divide a segment on to an 'n' number of equal parts.
    - - The relationship between the measurement in a drawing and the measurement of a real object.
    - - When do we use it?
        
        We use it in industry and engineering.
      - What is it?
        
        It is the act and discipline of composing plans that visually communicate how something functions or is to be constructed. It is essential for communicating ideas and make them easier.