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d1 = 18 cm
Luas layang layang=360
ditanya d2 ..??
L layanglayang=d1×d2 : 2
360=18×d2:2
360×2=18d2
d2=720:18 -> d2=40 cm
d2 = 360 cm x 2 : 18 cm
= 720 cm : 18 cm
= 40 cm