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K.persegi panjang :
K = 2 × ( p + l )
= 2 × ( 1,5 l + l )
= 3l + 2l
84 = 5l
l = 16,8 cm
p = 1,5 × 16,8
= 25,2 cm
Luas persegi panjang :
= p × l
= 25,2 × 16,8