NCERT Class 10 Math Chapter 10 वृत (Circles) deals with the important concepts of tangents drawn to a circle and their properties. In earlier classes, students have already studied the basics of a circle, chords, arcs, and other related terms. In this chapter, the focus is mainly on tangents and the number of tangents that can be drawn from a given point to a circle. These concepts are very useful in geometry and also carry good weightage in the board exams.
I am writing about this chapter because many students feel that geometry becomes tricky when it moves towards abstract concepts. But in reality, वृत is one of the easiest chapters once the logic is understood. The properties taught here are straightforward and can be applied in solving both direct and application-based questions. For example, knowing that the tangent to a circle is always perpendicular to the radius at the point of contact helps in solving many problems quickly. Understanding this chapter also builds a base for higher classes where circles and tangents play an important role in coordinate geometry and calculus. Having the NCERT PDF at hand helps students revise formulas, go through solved examples, and practise exercises in an organised way.
Key Concepts in Chapter 10 वृत
This chapter includes:
- Definition and properties of tangent to a circle
- Theorem: A tangent at any point of a circle is perpendicular to the radius through the point of contact
- Theorem: The lengths of tangents drawn from an external point to a circle are equal
- Problems based on finding tangent lengths and applying properties
Example for Practice
If two tangents are drawn to a circle from an external point and the length of one tangent is 5 cm, then the other tangent is also 5 cm because tangents from an external point are always equal.
Download PDF
Students can download NCERT Class 10 Math Chapter 10: वृत PDF free of cost from this website.