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= 18 kali 18
=324
L2 = 1/2 kali alas kali tinggi
= 1/2 kali 18 kali 15
= 9 kali 15
= 135
LT = 324 + 135
= 459 (a)
= 18 x 18
= 324
segitiga = a x t : 2
= 18 x 15 : 2
= 135
luas gabungan = 324 + 135
= 459
= A.