Penjelasan dengan langkah-langkah:
kalau diketahui r rumus Kelilingnya 2πr
kalau diketahui d rumus Kelilingnya πd
a) keliling = πd
= 22/7 × 28
= 88 cm
b) keliling = 2πr
= 2 × 3,14 × 20
= 125,6 cm
c) keliling = πd
= 3,14 × 48
= 150,72 cm
d) keliling = 2πr
= 2 × 3,14 × 50
= 314 cm
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Penjelasan dengan langkah-langkah:
kalau diketahui r rumus Kelilingnya 2πr
kalau diketahui d rumus Kelilingnya πd
a) keliling = πd
= 22/7 × 28
= 88 cm
b) keliling = 2πr
= 2 × 3,14 × 20
= 125,6 cm
c) keliling = πd
= 3,14 × 48
= 150,72 cm
d) keliling = 2πr
= 2 × 3,14 × 50
= 314 cm