Two circular coins have radii of 7 cm and 14 cm respectively. Find the difference in their areas. (Take π = 22/7.)
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Worked Solution
Step 1: Area of larger coin = πr² = 22/7 × 14² = 22/7 × 196 = 616 cm².
Step 2: Area of smaller coin = πr² = 22/7 × 7² = 22/7 × 49 = 154 cm².
Step 3: Difference = 616 − 154 = 462 cm².
Final: 462 cm².
Answer: 462 cm²
Correct answer: 462 cm²
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