pliss tolong jawab dan pakai cara no 25

Penyelesaian :
Ada dua cara ^_^

Cara 1
Keliling lingkaran
= 2 . phi . r
= 2 . 3,14 . 100 cm
= 2 . 314 cm
= 628 cm
Opsi => D

Cara 2
Keliling lingkaran
= phi . d
= 3,14 . 200 cm
= 628 cm
Opsi => D

Good Luck ;)

K = π . d
K = 3,14 . 200
K = 314 . 2 = 628 cm ( d )