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9. D.21
10. A.153,86
11. A.157
12. C.1848
13. B.154
14. A.1256

9) 1.386 cm² = 22/7·r²
r² = 1.386·7/22 cm²
r² = 441 cm²
r = 21 cm (D)

10) L = 3,14·(7 cm)²
= 3,14·49 cm²
= 153,86 cm² (A)

11) L = 1/2·3,14·(10 cm)²
= 1/2·3,14·100 cm²
= 1/2·314 cm²
= 157 cm² (A)

12) L = 3/4·22/7·(28 cm)²
= 3/4·22/7·784 cm²
= 3/4·2.464 cm²
= 1.848 cm² (C)

13) L = 22/7·(7 cm²)
= 22/7·49 cm²
= 154 cm² (B)

14) L = 3,14·(20 cm)²
= 3,14·400 cm²
= 1.256 cm² (A)