Jawaban:

1. a. L = 1.256 cm²

b. V = 4.186,66667 cm³

2. a. L = 2.464 cm²

b. V = 11.498,6667 cm³

Penjelasan dengan langkah-langkah:

1. Diket : r = 10 cm

Dit : a. L...cm²?

b. V....cm³?

Jwb : a. L = 4 × π × r²

= 4 × 3,14 × 10 × 10

= 4 × 31,4 × 10

= 4 × 314

= 1.256 cm²

b. V = 4/3 × π x r³

= 4/3 × 3,14 × 10 × 10 × 10

= 4/3 × 314 × 10

= 4/3 × 3.140

= 12.560/3

= 4.186,66667 cm³

2. Diket : d = 28 cm

Dit : a. L...cm²?

b. V....cm³?

Jwb : a. L = π × d²

= 22/7 × 28 × 28

= 22 × 4 × 28

= 88 × 28

= 2.464 cm²

b. V = 1/6 × π x d³

= 1/6 × 22/7 × 28 × 28 × 28

= 1/6 × 22 × 4 × 28 × 28

= 1/6 × 88 × 28 × 28

= 1/6 × 2.464 × 28

= 1/6 × 68.992

= 11.498,6667 cm³

Jangan lupa jadikan jawaban tercerdas, kasih bintang 5 & jangan lupa follow brainly aku ya...