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= 2×(p+l)
= 2×(10+16)
= 52
K persegi
= 52:2
= 32
s persegi
= 32:4
= 8 cm (c)
keliling persegi panjang = 2.(p+l) = 2.(16+10) = 2 x 26 = 52
diket. K. persegi panjang EFGH = 2x K. persegi ABCD; jadi 52 : 2 =26
sisi persegi ABCD = 26 : 4 = 6,5 (D)