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=40:2= 20 cm²
luas sgtga 2 = (8*8) : 2
=64:2= 32 cm²
luas sgtga 3 = (3*8) : 2
=24:2= 12
luas yg diarsir
= (l.sgtga 1 + l.stga 2) - 2(l.sgtga 3)
= (20+32) - 2(12)
= 52-24= 28 cm²
maaf kalo ada kesalahan,,,