Which equation could be used to find the perimeter of a rectangle that has a width of 12 cm and a length of 16 cm?

a. P = 2 · 12 + 2 · 16

b. P = 2 · 12 + 16

c. P = 12 · 16

d. P = 12 + 16

It would be a. because a rectangle has 2 pairs of congruent sides so since the width is 12 and there are 2 sides with that measurement it would be 2 (12) and the same goes for the length, and then you add them together.