Posted by Dylan on Friday, May 6, 2011 at 11:45am.
The ratio of a circle's circumference to its radius is 2ð
C=2rð
120°/360°=1/3
The length of the chord connecting the radii of the arc:
L=2rð/3
L=2*6*3.14159/3=37.69908/3= 12.56636 cm
ð=pi number
The answer given by "anonymous" cannot be correct.
How can the chord be longer than the diameter, which would be only 12 cm ?
Draw an altitude from the centre to the chord creating two right-angled triangles with angles 30, 60 and 90°
If x is half of the chord
cos 30° = x/6
x = 6cos30 = 6√3/2 = 5.196
so the chord is 2(5.196) = 10.392
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