Answer:
CF = 7.2 cm
Explanation:
given 2 chords intersecting inside a circle , then the product of the parts of one chord is equal to the product of the parts of the other chord, that is
BF ×FC = DF × EF
10x = 8 × 9 = 72 ( divide both sides by 10 )
x = CF = 7.2 cm