Two identical 6 cm × 2 cm strips are joined to make this L. What is the perimeter of the L?

The L fits in an 8 cm × 6 cm box and every step goes outward, so its perimeter equals that box's: 2 × (8 + 6) = 28 cm. Going round: 2 + 4 + 6 + 2 + 8 + 6 = 28. (32 adds both strips' perimeters, 16 + 16, counting the joined edge.)