CBSE Maths: Circles and their Properties

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What is the formula for the circumference of a circle?

C = 2πr

Which formula is used to find the area of a circle?

A = πr²

If the radius of a circle is 10 units, what is its circumference?

62.84 units

What is the region enclosed by the boundary of a circle called?

Area

What is the definition of a circle?

A closed curve that divides the plane into two equal parts

What is the symmetry property of a circle?

Symmetry with respect to any line passing through its center

What is a chord in relation to a circle?

A line segment joining any two points on a circle

What does the theorem on tangents state?

If two tangents are drawn from an external point to a circle, then the angle subtended by the chord of the circle at the center is equal to the angle subtended by the chord at the point of contact of the tangents.

Study Notes

Maths CBSE: Understanding Circles

In the field of mathematics, circles are an essential concept that forms a fundamental part of geometry. Understanding circles, their properties, and how to work with them is crucial for students studying Maths CBSE.

Definition of a Circle

A circle is a simple closed curve which divides the plane into two equal parts, called its interior and exterior. It is the set of all points in a plane that are at a given distance from a fixed point called the center of the circle. The distance from the center to any point on the circle is called the radius of the circle.

Properties of a Circle

Some key properties of a circle include:

  1. Symmetry: A circle has symmetry with respect to any line passing through its center.
  2. Equidistance: All points on the circle are at an equal distance from the center.
  3. Chord: A chord is a line segment joining any two points on a circle.

Circle Theorems

There are several theorems related to circles in mathematics, such as:

  1. Theorem on Chords: If two chords of a circle are equal and they have the same center, then they bisect each other.
  2. Theorem on Tangents: If two tangents are drawn from an external point to a circle, then the angle subtended by the chord of the circle at the center is equal to the angle subtended by the chord at the point of contact of the tangents.

Circumference and Area of a Circle

The circumference of a circle is the total distance covered by its boundary, while the area is the region enclosed by the circle. The mathematical formulas for the circumference and area of a circle are:

  • Circumference: C = 2πr, where C is the circumference and r is the radius of the circle.
  • Area: A = πr², where A is the area and r is the radius of the circle.

Solved Examples

Let's solve a few problems related to circles:

  1. Find the circumference of a circle with radius 5 units. C = 2πr = 2π * 5 = 10π ≈ 31.42 units.

  2. Find the area of a circle with radius 4 units. A = πr² = π * 4² = 16π ≈ 50.27 square units.

Conclusion

Understanding the concept of circles, their properties, and related theorems is crucial for students studying Maths CBSE. With the help of formulas for circumference and area, you can easily solve problems related to circles. Practice and understanding these concepts will help you develop a strong foundation in geometry and mathematics.

Explore the essential concept of circles, their properties, and theorems in geometry. Learn about the symmetry, equidistance, and chord of a circle, along with the circumference and area formulas. Enhance your understanding of circles to build a strong foundation in mathematics.

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