← 2.4 Circles, Chords and Tangents
A direct common tangent
Mathematics · Grade 11 · about 40 minutes
A direct common tangent does not cross between the circles, and its length is the square root of d squared minus (R - r) squared.
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- 8 sections of explanation, worked examples and diagrams
- 1 practice task with hints and worked answers
- A quiz that marks itself as you go
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Other lessons in this sub-strand
- The line from the centre to a chord
- Two chords that cross
- A tangent meets the radius
- The two tangents from one point
- Drawing the tangents
- A tangent and a secant
- Two secants from one point
- The alternate segment
- A direct common tangent
- A transverse common tangent
- When two circles touch
- The circle through three vertices
- The incircle and an excircle
- Centroid and orthocentre