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5.) r = 34 cm
L = Π × r × r
= 3,14 × 34 × 34
= 3,14 × 1.156
= 3.629,84 cm²

6.) r = 21 cm
L = Π × r × r
= 22/7 × 21 × 21
= 22/7 × 441
= 1.386 cm²

7.) r = 20 cm
L = Π × r × r
= 3,14 × 20 × 20
= 3,14 × 400
= 1.256 cm²

8.) r = 24 cm
L = Π × r × r
= 3,14 × 24 × 24
= 3,14 × 576
= 1.808,64 cm²

9.) r = 42 cm
L = Π × r × r
= 22/7 × 42 × 42
= 22/7 × 1.764
= 5.544 cm²

10.) r = 38 cm
L = Π × r × r
= 3,14 × 38 × 38
= 3,14 × 1.444
= 4.534,16 cm²

Mohon koreksinya jika salah.