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2 × (10 + kanan kiri)
50 = 2 × (10 + KK)
50 ÷ 2 = 10 + KK
25 = 10 + KK
25 ÷ 10 = KK
2,5 = KK
kanan dan kiri = 2,5 ÷ 2
= 1,25 cm
masing" sisi kanan dan kiri adalah 1,25 cm.
maaf kalau ada kesalahan