Circles:
The chapter 'Circles' carrying the weightage of 6 - 7 marks in the board examination. It covers the concepts like tangent to a circle, length of tangent from a point, tangent from an external point.
Most possible variation of question types that we can expect in board exam as per previous year question paper are discussed below.
| Total marks 6 - 7 | |
| Variation 1 | Variation 2 |
Total marks=6
|
Total marks=7
|
To prepare well for the board examination, it is necesary to understand the following concepts clearly.
- Tangent to a circle - Length of a tangent, one tangent form, radius perpendicualr to tangent at point of contact.
- Number of tangents
- Tangent from an external point.
| Important Concept (Learning Outcomes) | Expected Question Type | Concept deat with |
| Tangent to a circle | Sec A, Sec B, Sec, Sec C | |
| Tangent to a circle | Sec D | |
| Tangent from an external point | Sec A, Sec B, Sec C, Sec D |
Let us recall the concepts in circles:
Tangent: The tangent to a circle is perpendicular to the radius through the point of contact.
Theorem 1: The tangent at any point of a circle is perpendicular to the radius through the point of contact
Theorem 2: The length of the tangents drawn from an exterior point to a circle are equal.