Jawaban:

1. K = π × d

K = 3,14 × 10

K = 31,4 cm

2.diketahui keliling =99

rumus = 2 x π x r = 99

2 x 22/7 x r = 99

r = 99 x 7/44

r = 15,75

3. diket = keliling = 23,55 cm.

rumus = keliling lingkaran = 2 x π x r

23,55 cm = 2 x 3,14 x r

r = 23,55/6,28 = 3,75 cm.

maka, diameternya= 3,75 x 2 = 7,5 cm

4. 9:8

caranya ada di atas

5.keliling = π × d

keliling = 22/7 × 42

keliling = 132 cm

r = 6 × 3,5 = 6 × 7/2 = 21

jari jarinya = 21 cm

r = 21 cm

d = 21 × 2 = 42 cm

Penjelasan dengan langkah-langkah:

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