[
  "The two semicircle diameters together equal the square side of 28 cm. Use ratio 2:5 to find each radius.",
  "Radius P = 4 cm, Radius Q = 10 cm. Each semicircle arc = pi x radius.",
  "Add the 3 straight sides of the square (3 x 28 = 84 cm) to both arcs."
]