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L Layang-Layang = 18 x 24 = 432 : 2 = 216
L Persegi Panjang - L Layang-Layang = 432 - 216 = 216
Semoga membantu. Maaf klo salah
L. persegi panjang = p.l = 24.18 = 432 cm kuadrat
L. layang-layang =1/2.d1.d2 =1/2.24.18 = 216 cm kuadrat.
Jadi, luas yg diarsir= 432-216 = 216 cm kuadrat.