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= √16+9
= √25
= 5 cm
Keliling belah ketupat = s + s + s + s atau 4s
= 4(5)
= 20 cm
N.B. : 4 dan 3 itu dari setengah diagonal 1 dan setengah diagonal 2
panjang sisinya 5 cm
jadi kelilingnya 5 * 4 = 20 cm