How would you write the reversible statement as a biconditional?
if two perpendicular lines intersect, they form four 90 degree angles.

a.) two intersecting lines are perpendicular if and only if they form four 90 degree angles
b.) two intersecting, perpendicular lines do not form four 90 angles
c.) four 90 degree angles are formed by intersecting lines
d.) perpendicular lines do not intersect