The rectangle's area equals the circle's area. The rectangle's width equals the radius of the circle.
• Area of circle = \( \pi r^2 \). Area of rectangle = length × r.
• Set equal: length × r = \( \pi r^2 \).
• Cancel r (r ≠ 0): length = \( \pi r \).
• From the figure, r = 7 cm.
• Length = \( \dfrac{22}{7} \times 7 = 22 \) cm.
Final Answer: 22 cm