Hitunglah keliling. Lingkaran jika: A. Jari jarinya 21 cm c. Jari - jarinya 10 cm -

A. jari jari = 21 cm
L = π × r × r
= 22/7 × 21 × 21
= 1386
B. Diameter 20 cm
jari jari = 10
L = π × r × r
= 3,14 × 10 × 10
= 314
C. jari jari = 10 cm
L = π × r × r
= 3,14 × 10 × 10
= 314
D. Diameter = 28
Jari jari = 14
L = π × r × r
= 22/7 × 14 × 14
= 616
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Source https://sebuahcatatan.live/as/catatanbrain/tugas/2166870