I am not sure on how to do this

Answer:
CP = 8 cm
Step-by-step explanation:
Given two chords that intersect inside a circle, then then the product of the parts of one chord is equal to the product of the parts of the other chord, that is
DP × CP = AP × PB ← substitute values
6 × CP = 12 × 4
6CP = 48 ( divide both sides by 6 )
CP = 8
Answer:
8.
Step-by-step explanation:
Use the intersected chords of a circle theorem:
AP * PB = CP * PD
12 * 4 = CP * 6
6CP = 48
CP = 8.