Two parallel chords are drawn in a circle of diameter 30.0 cm. The length of one chord is 24.0 cm and the distance between the two chords is 21.0 cm; find the length of the other chord.
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d=30
so r=15
length of c1 =24
C1/2=12
r^2=12^2+x^2
225=144+x^2
x^2=81
x=9
the difference between c1 and c2 =21
21=x+9
x=12
225-144=(c2/2)^2
(c2/2)^2=81
(c2/2)=9
c2=18
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