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t = 10 -6
= 4
alas segitiga
a = 1/2 x s
= 1/2 x 6
= 3
sisi miring
luas permukaan persegi tampa tutup
Lp = 5 x s²
= 5 x 6²
= 5 x 36
= 180
luas Δ tegak limas seluruhnya
L Δ = 4 ( a x t)
= 4 ( 3 x 5 )
= 4 ( 15)
= 60 cm²
luas permukaan seluruh bangun
Ltotal = 60 + 180
= 240 cm²
jawabannya B