Question

heu army's can i get some notes of circle lesson class 9​

Answer 1

Answer:

Step-by-step explanation:

   The set of all the points in a plane that is at a fixed distance from a fixed point makes a circle.

   A Fixed point from which the set of points are at fixed distance is called the centre of the circle.

   A circle divides the plane into 3 parts: interior (inside the circle), the circle itself and exterior (outside the circle)

The distance between the centre of the circle and any point on its edge is called the radius.

A line that touches the circle at exactly one point is called it’s tangent. A line that cuts a circle at two points is called a secant.Chord

-The line segment within the circle joining any 2 points on the circle is called the chord.

Diameter

– A Chord passing through the centre of the circle is called the diameter. – The Diameter is 2 times the radius and it is the longest chord.

Arc

– The portion of a circle(curve) between 2 points is called an arc. – Among the two pieces made by an arc, the longer one is called a major arc and the shorter one is called a minor arc.

Circumference

The perimeter of a circle is the distance covered by going around its boundary once. The perimeter of a circle has a special name: Circumference, which is π times the diameter which is given by the formula 2πr

Segment and Sector

– A circular segment is a region of a circle which is “cut off” from the rest of the circle by a secant or a chord. – Smaller region cut off by a chord is called minor segment and the bigger region is called major segment. –

-A sector is the portion of a circle enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector.