3. Do not intersect
(a) Circles of the same size
Number of common tangents |
Properties of common tangents |
Four common tangents:
AB, CD, PS and RQ |
AB = CD = OV
PS = RQ
AB // OV // CD |
(b) Circles of different sizes
Number of common tangents |
Properties of common tangents |
Four common tangents:
AB, CD, PS and RQ |
AB = CD
BT = DT
PS = RQ
OA // VB
OC // VD |