The semi-perimeter (Length + Breadth) is 4 units. Given units at ratio 3:1, we find 1 unit then multiply.<br><br>[[model:questions/solutions/q4509.png]]<br><br>• Semi-perimeter → 96 ÷ 2 = 48 cm (Length + Breadth)<br>• Total units → 3 + 1 = 4<br>• 1 unit → 48 ÷ 4 = 12 cm<br>• Breadth = 1u → 12 cm; Length = 3u → 3 × 12 = 36 cm<br><br>The breadth is 12 cm, and the length is 36 cm.<br>Check: 2 × (36 + 12) = 2 × 48 = 96 cm. ✓