# Circle

TGT-Maths à HGI School
8 Jul 2020
1 sur 14

### Circle

• 3. Teaching Points are - 1. CIRCLE 2. PARTS OF A CIRCLE  Centre  circumference  Radius  Diameter  Chord  Arc  Semicircle 3. RELATION B/W DIAMETER & RADIUS
• 4. What is an Circle? The word circle comes from the Latin word “ CIRCULUS” which means disc. A circle is set of points in a plane that are equidistant from a given fixed point. The fixed point is called the centre of the circle. A circle has an interior as well as exterior region.
• 5. Parts of a circle Centre The point at which we place the needle end of the compass and move the pencil around it is the centre of the circle.
• 6. Circumference The length of the boundary of the circle is the circumference of the circle. In other words, it is the perimeter of the circle.
• 7. Radius The line segment joining the centre to any point on the circle. * Infinite number of radius can be drawn in a circle. * All the radii of a circle are equal in length.
• 8. Diameter A diameter of a circle is line segment that joins any two points on the circle and passes through its centre. Infinite number of diameters can be drawn in a circle and all are equal in length.
• 9. Chord A line segment that joins any two points on the circle is called chord. Infinite number of chords can be drawn. Diameter is the longest chord of a circle.
• 10. Arc An arc of a circle is a part of circle included between two distinct points of the circle. The larger arc is called MAJOR ARC and the smaller arc is called MINOR ARC.
• 11. Semicircle The diameter of a circle divide it into two equal halves and each half is called semicircle.
• 12. Concentric Circles Two or more circles in same plane are called concentric circles if they have same centre.
• 13. Relation Between Radius and Diameter
• 14. Thank You