(Discrete structure) Q. Determine whether the relation R on the set of all integers is reflexive, symmetric, antisymmetric, and/or transitive,

where (, ) ∈ if and only if

a) x _= y. b) xy ≥ 1.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units