Form the bi conditional statement p q, where
(i) p: A triangle is an equilateral triangle. q: All three sides of a triangle are equal.

Solution:

(i) We use if and only if, in the bi conditional statement.

$p$: A triangle is an equilateral triangle

$q$: All three sides of a triangle are equal.

Therefore,

$p\leftrightarrow q =$ A triangle is an equilateral triangle if and only if all the three sides of a triangle are equal.