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panjang tali = nr + 2πr
pt = 12 . 21 + 2 . 22/7 . 21
pt = 252 + 132
pt = 384 cm
jwbnnya A
done(:
Penyelesaian :
panjang tali paralon : ↓
=> π.r + 2π.r
=> (12 × 21) + (2 × × 21)
=> 252 + 132
=> 384 cm
Semoga membantu ya.