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segitiga besar :
alas = 5 - (-3) = 8 satuan panjang
tinggi = 5 - (-4) = 9 satuan panjang
segitiga kecil :
alas = 1 -(-3) = 4 satuan panjang
tinggi = 5 -(-4) = 9 satuan panjang
= (1/2 * 8 * 9) - (1/2 * 4 * 9)
= (4 * 9) - (2 * 9)
= 36 - 18
= 18 satuan luas