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panjang ? =
= 15 m
L trapesium seluruhnya - L persegi
Ltrap. = ( a + b ) x t / 2
= ( 35 + 15 ) 20 / 2
= 50 x 10 = 500
Lpersegipanjang = 12 x 8 = 96
500 - 96 = 404
30.
Ltrap H = ( 12 + 16 ) x 9 / 2 = 126
Ltrap B = ( 16 + 10 ) x 9 / 2 = 117
L jajar genjang = 8 x 4 = 32
LtrapH + LtrapB - Ljajargenjang = 126 + 117 - 32
= 211