what is a congruent circle?
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Diameters of the same or congruent circles are congruent. In the same or congruent\ncircles, congruent central angels have congruent arcs.\n\nIn Mathematics, congruent means:\n\nCoinciding exactly when superimposed: congruent triangles.\nOf or relating to two numbers that have the same remainder when divided by a third number. For example, 11 and 26 are congruent when the modulus is 5.
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The word concentric means objects having the same center. As we know that a ring is a 3-d analogy of a circle in 2-d. It can be broken into constituent concentric circles which lie in various paralel 2-d planes. I guess ur question is about concentric rings rather concentric ring. If there are more than one rings with different radii and orientation but same center, they are called as concentric rings.
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Yes, in that case, the circle is called a point.
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Almost a coicle!\nEach side would subtend an anhle of slightly more than 1.5degrees so it is very close to a circle. I don't think it has any official name.
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A right angle.  \n\nSupplementary means the angles add up to 180˚, and congruent means they are the same size.  So for two angles to be both congruent and supplementary, they both need to be exactly half of 180˚.  Half of 180˚ is 90˚, so they are right angles.
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These are best known as "Euclid's Postulates":\n1. Any two points can be joined by a straight line.\n2. Any straight line segment can be extended indefinitely in a straight line.\n3. Given any straight line segment, a circle can be drawn having the segment as radius and one endpoint as center.\n4. All right angles are congruent.\n5. Parallel postulate. If two lines intersect a third in such a way that the sum of the inner angles on one side is less than two right angles, then the two lines inevitably must intersect each other on that side if extended far enough.
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The radius of a circle is the distance from the center of the circle to the edge of the circle.
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3 - you are standing in a circle
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no, a circle has infinite lines of symetry. For an equilateral triangle, i believe there r only 3
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The Regnal Circle is a symbol of completeness, one of no beginning, no end, but a continual way of development of the whole person to an all-round life.
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Statements\n1) PT tangent to circle O, PAB is a secant.\nReason: Given\n2)Draw line TB\nreason: two points determine a line\n3) angle mtp is congruent to angle mtb\nreason: an angle bisector(line MT) bisects an angle into two congruent angles\n4) draw tangent XY that meets at point T and is parallel to line segment PB\nreason: a tangent may be drawn to one point of a circle\n5) angle mtb is congruent to angle pmt \nreason: when a transversal crosses two parallel lines the alternate interior angle formed are congruent\n6) angle mtp is congruent to angle pmt\nreason: i forgot the name of this theorom look it up(something like if x=y and y=z then x=z)\n7) triangle PMT is isoceles \nreason= converse of the base angles theorm\n\ni hope i was able to help somewhat, i tried to draw a diagram to the best of my ability with the given information. by the way i know there was another way to do the proff with circle properties but i think it was much easier to draw a tangent parallel to PB saved a lot of steps also. good luck!
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Because the circle, in its every form, is the most marbelous shape in the universe.  It really is when you think about it.....
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Pi is what is know as an "irrational" number because it cannot be written as a ratio of two integers.  However, it can be easily defined as the ratio of the circumference of a circle (the distance around the circle) to the diameter of the circle (the circle's width).  This makes it an extremely useful number to "approximate" (since it cannot be expressed fully with a 100% accurate number) when dealing with anything that is cyclical (planetary orbits or repeating patterns for example).  I've included a link with more fun facts.
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concentric circles are circles within circles, think target symbol
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Are you sure you don't mean congruence or confluence?\n\n"Congluence" is not a word.\n\nIn any case, when you figure out what word you mean, use a dictionary. Here's a free online dictionary -- www.dictionary.com.
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1.  When two lines cross, pairs of vertical angles are congruent.\n\n2. If two parallel lines are cut by a transbersal, alternate interior angles formed are congruent.\n\n3. If two parallel lines are cut by a transbersal, alternate exterior angles formed are congruent.\n\n4. If two parallel lines are cut by a transbersal, corresponding angles formed are congruent.\n\n5.  Opposite angles of a parallelogram are congruent.\n\n6. Base angles of an isosceles triangle or trapezoid are congruent.\n\n7. Perpendicular lines meet to form congruent angles.\n\n8.  If two angles are both congruent to a third angle, they are congruent to each other.\n\n9.  A pair of right angles are congruent. \n\n10.  Any two angles of an equilateral triangle are congruent.\n\nThere are more but most are variations of the above.
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http://en.wikipedia.org/wiki/Squaring_the_circle\n\nAll you need is there...