Question

Point C is the center of the circle. What is the measure of arc AB if < ACB is equal to 80 ?

Answer 1

=80 as well.

Answer 2

why does it also = 80?

Answer 3

read it, at the very first section http://www.regentsprep.org/regents/math/geometry/gp15/circleangles.htm

Answer 4

got it?

Answer 5

because "A central angle is an angle formed by two intersecting radii such that its vertex is at the center of the circle."?

Answer 6

An arc of a circle has the same measure as the central angle that intercepts it.