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= 1/2 x 9 x 16
= 72 cm2
L.segitiga besar= 1/2 x a x t
= 1/2 x 10 x 16
= 80 cm2
L.p.p= p x l
= 42 x 21
= 882 cm2
L.seluruhnya= L.s.kecil + L.s.besar + L.p.p
= 72 + 80 + 882
= 1.034 cm2 (B)
maaf kalo jawabannya salah