jika diameter piring 21 cm maka keliling piring tersebut...cm A.44 B.66 C.132 D.346,5 tolong jawab pakai cara

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Mapel : Matematika
Tentang : Bangun Datar
Pertanyaan yg diajukan : 1
Pembahasan :

Diketahui :
- Diameter (d) : 21 cm

Ditanya :
- Keliling (K)

Cara :

[tex]k = \pi \times d \\ \\ k = \frac{22}{7} \times 21[/tex]

[tex]k = 22 \times 3 \\ \\ k = 66 \: cm[/tex]

Jadi, Keliling piring tersebut adalah 66 cm. Jawabanmu yg B

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