(i) A quadrilateral is a rectangle if and only if it is equiangular.
(ii) A number is divisible by 3 if and only if the sum of the digits of the number is divisible by 3.
(i) A quadrilateral is a rectangle if and only if it is equiangular.
(ii) A number is divisible by 3 if and only if the sum of the digits of the number is divisible by 3.