## What are circles Class 9?

Circles class 9 – The collection of all points equidistant from a fixed point in a plane is called a circle.

**How do you find the center of a circle in Class 9?**

We have to find its centre.

- Take points P, Q, R on the circle.
- Join PR and RQ.
- Take a compass.
- Join the points intersected by the arcs.
- Take a compass.
- Join the points intersected by the arcs.
- The point where the two perpendicular bisectors intersect is the centre of the circle.

### How many diameters can a circle have?

infinitely many

Thus the diameter of the circle is twice as long as the radius. So, infinitely many diameters can be formed in the circle.

**What are types of circle?**

There are three types of circle are as follows:

- Tangent Circle: It is a circle that intersects more than two circles at a common point is called tangent circles.
- Concentric Circle: Two or more than two circles that have the same center are called the concentric circle.

#### How do you draw a 5cm circle?

Steps of construction:

- With O as the centre and 5cm as radius draw a circle.
- Take a point A on the circumference of the circle and join OA.
- Draw AX perpendicular to OA.
- Construct ∠AOB = 120° where B lies on the circumference.
- Draw BY perpendicular to OB.
- Both AX and BY intersect at P.

**How do you make a circle in math?**

Graphing a circle anywhere on the coordinate plane is pretty easy when its equation appears in center-radius form. All you do is plot the center of the circle at (h, k), and then count out from the center r units in the four directions (up, down, left, right). Then, connect those four points with a nice, round circle.

## What line is tangent to the circle O?

A tangent to a circle is a straight line which touches the circle at only one point. This point is called the point of tangency. The tangent to a circle is perpendicular to the radius at the point of tangency. In the circle O , ↔PT is a tangent and ¯OP is the radius.

**How will you complete an arc of a circle?**

1 Answer

- Steps of construction:
- (i) Take three point A, B, C on the given Arc.
- (ii) Join AB and BC.
- (iii) Draw the perpendicular bisectors of chords AB and BC which interest each other at point O, then O will required center of the required circle.
- (iv) Join OA.
- (v) With center O and radius OA, complete the circle.

### How many books are there in 9th class?

NCERT Books for Class 9 Hindi NCERT prescribes 4 books for the class which are – Kshitij, Sparsh, Kritika and Sanchayan.

**What is vaccination Class 9?**

Vaccine – It is suspension of disease-producing microbes. which does not cause disease but on entering, body initiates immune system to produce. antibodies against particular disease and.

#### What is a circle class 9 solutions?

RD Sharma Class 9 Solutions of Chapter 16 consist of various topics such as Circles explained in a step by step and detailed way for an easy understanding. In brief, a circle is a closed plane curve consisting of all points at a given distance from a fixed point within it, which is called the center of the circle.

**What is NCERT class 9 Maths Chapter 10 circles?**

NCERT solutions Class 9 Maths Chapter 10 Circles are designed by experts to help students prepare well for the final exam. Structured in accordance with the NCERT syllabus and guidelines directed by CBSE, these solutions are an amazing way to make learning easy for students.

## How to calculate area of Circle in Class 9 Maths?

The area of the circle can be calculated by applying the formula: A = π r 2 Where: A is the Area, r is the radius and the value of π is 3.14. Key Features of NCERT Solutions for Class 9 Maths Chapter 10- Circles. The solutions for the chapter-Circles works as a reference for the students.

**What is a chord in math class 9?**

A chord is a line segment drawn between any two points in the circle. At the same time, the diameter is drawn in the middle of the circle. It cuts the circle into two halves. The radius of a circle is defined as a half part of the diameter. d = 2r. Q3. How are NCERT Solutions for Class 9 Maths Chapter 10 helpful for Class 9 students?