Question

butuh cepat

gw kasih poin yg banyak

tapi harus bener​

Answer 1

Jawaban:

1.A Keliling = 2π×r = 2×22/7×7 = 44cm

1.c Keliling=π×d = 22/7 × 21 = 66cm

Answer 2

Jawaban:

1. a. jari-jari 7 cm

K = 2πr

= 2 x 3,14 x 7

= 43,96

= 44 cm

c. diameter 21 cm

r = 21 : 2

= 10,5

K = 2πr

= 2 x 3,14 x 10,5

= 65,94

= 66 cm

2. keliling 22 cm

[tex]r = \frac{k}{2 \times \pi} [/tex]

[tex]r = \frac{22}{2 \times 3.14} [/tex]

[tex]r = \frac{22}{6.28} [/tex]

[tex]r = 3.5 \: cm[/tex]

luas 154 cm²

[tex] = \sqrt{ \frac{l}{3.14} } \\ \sqrt{ \frac{154}{3.14} } \\ \sqrt{49} \\ 7 \: cm[/tex]

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