. In the circle O, diameter AB= 20 cm, and chord AC= 16 cm, OP ⊥AC, then OP=……
A. 8 cm B. 7cm C. 6cm D. 5 cm E. 4cm
2.The distance between the two parallel chords AB and CD is
A. 4 cm B. 5cm C. 6 cm D. 7 cm E. 4cm
A,P,B and C,P,D are collinears,
then the value of x is
A.10 B.12 C.15
D.18 E.21
