12. If 0 is the center of the circle, then the measure of angle ZACB is:
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L AOB=80°. (measure of central angle)
m(arc AB)=80°. (by property - measure of corresponding arc is equal to measure of central angle )
L ACB=1/2m(arc AB )
=1/2 *80
. =40°
L ACB = 40°
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