Multiple choice The area of a rectangle is 42 sq. cm and its length is 7 cm. Find its perimeter. 14 21 26 24 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Area = length × width, so 42 = 7 × width, giving width = 6 cm. Perimeter = 2 × (length + width) = 2 × (7 + 6) = 26 cm. This requires finding the missing dimension first.