Class 10 · Chapter 10 · Geometry

Circles

Tangents: the one-point lines, and the right angles they always bring.

Source: NCERT Mathematics, Class 10

1. 10.1What Makes a Line a TangentAttention · Look at how many points the line shares with the circle.6 min
2. 10.2The Tangent Is Perpendicular to the RadiusAttention · Look at the radius that goes to the point of contact.8 min
3. 10.3Tangents from an Outside Point Are EqualAttention · Look at the two tangents from the same point: they are equal.8 min
4. 10.4The Right Triangle in Every Tangent ProblemAttention · Look at the right angle at the point of contact: it makes OP the hypotenuse.8 min