Silahkan Kaka… yg bisa jawab tolong di jawab ya…. ( ╹▽╹ )​

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Silahkan Kaka... yg bisa jawab tolong di jawab ya.... ( ╹▽╹ )​

Silahkan Kaka… yg bisa jawab tolong di jawab ya…. ( ╹▽╹ )​

Jawab:

1.

Diameter = 2 x 7 = 14 cm

Luas = π x 7 x 7 = 153, 94 cm^2

2.

Jari-jari = 7 : 2 = 3,5 cm

Luas = π x 3,5 x 3,5 = 34,49 cm^2

3.

Jari-jari = 28/2 = 14 cm

Luas = π x 14 x 14 = 615,75 cm^2

4.

Jari-jari = 56/2 = 28 cm

Luas = π x 28 x 28 = 2463,01 cm^2

5.

Luas = π x r^2 = 1386

Luas = r^2 = 1386/π

r = sqrt{frac{1386}{pi} } r = 21,004 = 21 cm

Diameter = 21 /2 = 10,5 cm

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