Math Circle Review

Circles Review – Fundamentals of Circles, Formulas for Circle,  Congruent CirclesTangent to a circlePolygon inscribed in a Circle  , Circle inscribed in a circleConcentric Circles

Class Questions –  Exercise 1         Exercise 2      Exercise 3        Exercise 4      Exercise 5

Video Lesson  – :   Example 11

Practice QuestionsSolutions

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 Circle Review

Circle is a geometrical shape with a set of points like p1, p2, p3……………….pn at equal distance from a fixed point ‘O’ in a plane.  O is the center of circle.

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 Fundamentals of Circle

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  •    OP  –           Line segment from center to its periphery is Radius of Circle
  •    AB  –           Line segment joining two endpoints on circle is a Chord of Circle
  •    TP  –           Line segment passing through center and joining two endpoints on circle is Diameter
  •                       Any chord passing through center is = Diameter
  •    Diameter = 2 times of radius , if radius is ‘r’ then diameter ‘D’ = 2xr
  •    Chord ≠ Diameter,   if not passing through center
  •    PQR is arc of circle
  •  a°” is central angle of circle
  •    The ratio of length of an arc to the circumference is equal to the angle of sector ‘a’
  •    The region bounded by two radii OP ,OR and arc PQR  is  a sector of a circle

                                                                                                                                   

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