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UNIT 2 (Technical drawing, also known as drafting is the act and…
UNIT 2
Technical drawing, also known as drafting is the act and discipline of composing plans that visually communicate how something functions or is to be constructed.
This need for precise communication in the preparation of a functional document distinguishes technical drawing from the expressive drawing of the preparation of a functional visual arts. Technical drawings are understood to have one intended meaning.
A tangent is a line in the plane of a circle that
intersects the surface of a circle. The point of tangency is on the radius of the circle, and the tangent line is perpendicular to it.
The circumcenter is the point at which the three perpendicular bisectors of the sides of a triangle intersect. This circle passes through all three vertices of the triangle
The incenter is the point at which the angle bisectors of a triangle intersect. It is the center of the circle that can be inscribed in the triangle.
The centroid is the point at which the medians of a triangle intersect. It is the center of gravity of the triangle.
Thales of Miletus; (VII-VI Century BC) was a pre-Socratic Greek philosopher,mathematician and astronomer from Miletus in Asia Minor, Thales is recognised as having made a break from understanding the world and universe by mythological explanations to instead find explanations for the existence of natural things and phenomena by theories and hypothesis, ergo science.In mathematics, Thales used geometry to calculate the heights of pyramids and the distance of ships from the shore.
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SCALE: Scale refers to the size of an object (a whole) in relation to another object (other everything). The scale we are talking about in technique. It is a relationship between a real object and the drawing
The definition of the altitude of a triangle is a line that extends from one vertex of a triangle perpendicular to the opposite side.
The definition of the median of a triangle is a line segment that extends from one vertex of a triangle to the midpoint of the opposite side.
A line forming a closed loop, every point on which is a fixed distance from a center point. It is named by the center. The circle to the left is called circle A
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A chord is a line segment that joins two points on a curve. In geometry, a chord is often used to describe a line segment joining two endpoints that lie on a circle.
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Tangent circles Tangent circles are two circles that are tangent to the same line at the same point .Two circles are externally tangent if each of the tangent circles lies outside the other. The point of contact (tangent point) lies on the line which passes through the centres of the two circles.
Ellipse (oval shape) An ellipse is the locus of all points of the plane whose distances to two fixed points add to the same constant. An ellipse is always symmetrical about its major axis. Major axis is the longest diameter of the ellipse. Minor axis :The shortest diameter of the ellipse is called as the minor axis.
The ovoid is a closed and plane curve, composed for two circular arc equal and other two unequal, it have a single axis of symmetry. This ovoid can be constructed with a compass by joining together arcs of different radii such that the centres of the arcs lie on a line passing through the joining point .