keliling persegi panjang adalah 72 cm dan panjangnya 20 cm.hitunglah lebar persegi panjang tersebut
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Keliling = 2 × (p + l)
72 = 2 × (20 + l)
72/2 = 20 + l
36 = 20 + l
l = 36 – 20
l = 16 cm
K = 2(P + L)
72 = 2(20) + 2(L)
72 = 40 + 2L
40 + 2L = 72
2L = 72 - 40
2L = 32
L = 32/2
L = 16/1
L = 16 CM
PEMBUKTIAN :
K = 2(P + L)
= 2(20 + 16)
= 2(36)
= 72 CM
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