hitunglah keliling lingkaran bila diketahui a diameternya 28 cm b.jari jari 15 cm

Please, let me answer your question :)
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Mapel : Matematika
Tentang : Bangun Datar
Pertanyaan yg diajukan : 2
Pembahasan :

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Diketahui :
- Diameter (d) = 28 cm

Ditanya :
- Keliling (K)

K = π x d
K = 22/7 x 28
K = 22 x 4
K = 88 cm

Jawaban : 88 cm

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Diketahui :
- Jari - jari (r) : 15 cm

Ditanya :
- Keliling (K)

K = 2 x π x r
K = 2 x 3,14 x 15
K = 6,28 x 15
K = 94,2 cm

Jawaban : 94,2 cm

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Hopefully this is the best for you.

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Heil Manstein!