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Two circles (C2) centered at B and B', with radius AB, cross again at point C. A circle (C3) centered at C with radius AC meets (C1) at D and D'. Two circles (C4) centered at D and D' with radius AD meet at A, and at O, the sought center of (C). Note: for this to work the radius of circle (C1) must be neither too small nor too large.
The pattern figure can be drawn by pen and compass, by creating seven interlinking circles of the same diameter touching the previous circle's center. The second circle is centered at any point on the first circle. All following circles are centered on the intersection of two other circles.
A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.
The design can be expanded ad infinitum depending upon the number of times the odd-numbered points are marked off." The pattern figure can be drawn by pen and compass, by creating multiple series of interlinking circles of the same diameter touching the previous circle's center. The second circle is centered at any point on the first circle.
The compass can have an arbitrarily large radius with no markings on it (unlike certain real-world compasses). Circles and circular arcs can be drawn starting from two given points: the centre and a point on the circle. The compass may or may not collapse (i.e. fold after being taken off the page, erasing its 'stored' radius).
Draw a line through two points; Draw a circle through a point with a given center; Find the intersection point of two lines; Find the intersection points of two circles; Find the intersection points of a line and a circle; The initial elements in a geometric construction are called the "givens", such as a given point, a given line or a given ...
Invert points A and B in circle C(r) to points A' and B' respectively. Under the assumption of this case, points A', B', and C are not collinear. Find the center E of the circle passing through points C, A', and B'. Construct circle E(C), which represents the inversion of the line AB into circle C(r). P and Q are the intersection points of ...
Consider a circle P with center O and a point A which may lie inside or outside the circle P. Take the intersection point C of the ray OA with the circle P. Connect the point C with an arbitrary point B on the circle P (different from C and from the point on P antipodal to C) Let h be the reflection of ray BA in line BC. Then h cuts ray OC in a ...