Mr Tan is fencing a rectangular vegetable plot at his HDB community garden in Toa Payoh. He uses 64 cm of ribbon to mark the perimeter of a small scale model of the plot. The width of the rectangle is 12 cm. What is the length of the rectangle?
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Worked Solution
Step 1: Recall the perimeter formula for a rectangle: Perimeter = 2 × (length + width).
Step 2: Substitute the known values: 64 = 2 × (length + 12).
Step 3: Divide both sides by 2: 64 ÷ 2 = length + 12, which gives 32 = length + 12.
Step 4: Subtract 12 from both sides: length = 32 − 12 = 20.
Step 5: Check: 2 × (20 + 12) = 2 × 32 = 64 cm. ✓
Final answer: The length is 20 cm.
Answer: 20 cm
Correct answer: 20 cm
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