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→Centre of a circle
====== [[Centre of a circle|Centre of a circle]] ======
====== [[Centre of a circle|Centre of a circle]] ======
All points on a circle are at fixed distance from a point, which is the center of a circle.
====== [[Radius and diameter of a circle|Radius and diameter of a circle]] ======
====== [[Radius and diameter of a circle|Radius and diameter of a circle]] ======
Marking radius and diameter of a circle and understand their relation.
====== [[Circumference of a circle|Circumference of a circle]] ======
====== [[Circumference of a circle|Circumference of a circle]] ======
Measuring circumference to understand it as the perimeter of the shape.
====== [[Semicircle|Semicircle]] ======
====== [[Semicircle|Semicircle]] ======
Partitioning a circle into two halves to form semicircles by drawing diameter.
====== [[Interior and exterior of a circle|Interior and exterior of a circle]] ======
====== [[Interior and exterior of a circle|Interior and exterior of a circle]] ======
Points on the planar surface of the circle within its circumference are said to be interior points and points on the outside of circumference are said to be its exterior points.
====== [[Basic elements of a circle]] ======
====== [[Basic elements of a circle]] ======
Investigation to understand basic parameters associated with circles.
====== [[Chord of a circle|Chord of a circle]] ======
====== [[Chord of a circle|Chord of a circle]] ======
Chords of a circle are of different sizes.The length of the chord increases as it moves closer to the centre and decreases as it moves away from the center.
====== [[Arc of a circle|Arc of a circle]] ======
====== [[Arc of a circle|Arc of a circle]] ======
The part of the circumference within the two points in either directions are called its arcs.
The part of the circumference within the two points in either directions are called its arcs.
====== [[Sector of a circle|Sector of a circle]] ======
====== [[Sector of a circle|Arcs and Sector of a circle]] ======
Slice of a circle enclosed between any two radii is called a sector.Semicircle and quadrant are special types of sectors.
==== Concept #3: Circles and Lines ====
==== Concept #3: Circles and Lines ====