Question

Carilah keliling lingkaran dengan jari2
1.13 cm
2.18 cm
3.22 cm
4. 36 cm
Disertai cara ya^_^

Answer 1

1. kel.lingkaran = 2 x phi x r = 2 x 3,14 x 13 = 81,64
2. rumusnya sama = 2 x 3, 14 x 18 = 113.04
3. 2 x 3, 14 x 22 = 138,16
4. 2 x 3, 14 x 36 = 226,08

Answer 2

1. r = 13 cm
d = 13 × 2 = 26 cm
K = πd
= 3,14 × 26
= 81,64 cm

2. r = 18 cm
d = 2 × 18 = 36 cm
K = πd
= 3,14 × 36
= 113,04 cm

3. r = 22 cm
d = 22 × 2 = 44 cm
K = πd
= 3,14 × 44
= 138,16 cm

4. r = 36 cm
d = 36 × 2 = 72 cm
K = πd
= 3,14 × 72
= 226,08 cm