Tolong dibantu yasemua2-5

Jawaban:

2. a. jari-jari 3,5 cm, diameter 7 cm, keliling 22 cm

b. jari-jari 11,15cm, diameter 22,3 cm, keliling 70,09 cm

c. jari-jari 10,5 cm, diameter 21 cm, keliling 66 cm

d. jari-jari 50,5 cm, diameter 101 cm, keliling 317,43 cm

3. 3,14× 2r = 628

2r = 628 ÷ 3,14

2r = 200

r = 200 ÷ 2

r = 100 cm

4. a. keliling 77 cm

jari-jari = 12,25cm, diameter 24,5 cm

b. keliling 141,3 cm

jari-jari = 22,48 cm, diameter 44, 96 cm

c. keliling 69,08 cm

jari-jari = 10,99 cm, diameter = 21,98 cm

d. Keliling = 198 cm

jari-jari = 31,5 cm, diameter = 63 cm

5. keliling area bermain = 22/7 × 28 = 88 m

keliling kolam ikan = 22/7 × 14 = 44 m

perbandingan keliling area bermain dan kolam ikan = 88 : 44 = 2 : 1