Tolong kerjain ya plisssss soalnya mau hari ini di kumpul​

Jawab:

Penjelasan dengan langkah-langkah:

1.a. L = π×r×r

=22/7 × 7×7

= 22 × 7

= 154cm²

1.b. L = π×r×r

= 3,14 ×20×20

= 3,14 ×400

= 1256 cm²

1.c. L = π×r×r

=22/7 ×35×35

=22×5× 35

= 3850cm²

2.d. L= π×r×r

= 22/7 ×7×7

= 22 ×7

= 154cm²

2.e. L= π×r×r

= 3,14×10×10

= 314 cm²

2.f. L= π×r×r

= 22/7 ×21×21

= 22×3×21

= 66×21

= 1386 cm²