In a circle, the chords AB and CD intersect each other at point L (internally). If AL = 9 cm, LB = 7 cm and LD = 3 cm, then find CL (in cm).

Correct option is B

Given:

Chord AB and CD as shown intersect at L
AL = 9 cm, LB = 7 cm and LD = 3 cm
Formula Used:
In a circle, if chords AB and CD intersect internally at a point L then,
​$$AL \times BL =CL \times DL$$​​
Solution:
​$$9 \times 7 = CL \times 3\\CL= 21cm$$​​