Скачать или смотреть Theorem 9.1 : Equal Chords of a Circle Subtend Equal Angles at the Centre | Class 9 Maths Ch. 9 |

Theorem 9.1 : Equal Chords of a Circle Subtend Equal Angles at the Centre | Class 9 Maths Ch. 9 |

Class 9 Chapter 9 Circles

The concepts in the circles chapter of class 9 math include:

Definition: A circle is a two-dimensional shape where all points on the circumference are the same distance from the center.

Center: The fixed point in the plane from which all points on the circle are the same distance.

Radius: The distance from the center to any point on the circle.

Circumference: The perimeter of a circle.

Chord: A line that goes from one point to another on the circle's circumference.

Diameter: A chord that passes through the center.

Tangent: A line that is perpendicular to the radius at the point of contact.

Arc: A part of the circumference.

Cyclic quadrilateral: A quadrilateral where the sum of the opposite angles is 180°.

Here are some other concepts related to circles:

A plane is divided into three parts by a circle: the interior, the exterior, and the circle itself.

Chords that are the same length subtend equal angles at the center.

A perpendicular drawn from the center to a chord bisects the chord.

Only one circle can pass through three non-collinear points.

The angles subtended by the same line segment are equal.




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