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Answer:
1. A = π²
= 3.14 × 9 × 9
= 28.26 × 9
= 254.34 cm²
2. A = π²
= 3.14 × 6 × 6
= 18.84 × 6
= 113.04 cm²
3. A = π²
= 3.14 × 40 × 40
= 125.6 × 40
= 5014 cm²
4. A = π²
= 3.14 × 2 × 2
= 6.28 × 2
= 12.56.cm²
5. A = π²
= 3.14 × 5 × 5
= 15.7 × 5
= 78.5 cm²