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=90.30
=2700
L trapesium=1/2(a+b).t
=1/2 .(40+50). 15
=1/2. (90). 15
=44 . 15
=675
jadi =L persegi panjang+L trapesium
2700+675=3375. jawaban ( b )
trapesium: ¹/² * (40+50) *15 = 45*15= 675
=2700+675= 3375m² (b)