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jadi 1/2 x 10 x 4 = 20
luas selimut segitiga = keliling alas x tinggi
? x 4 = 20
? = 20 : 4
= 5
Luas Prisma = ? rumusnya (2 x luas alas) + luas selimut
= 2 x (p x l) + luas selimut
= 2 x (10x3) + (20 + 5)
= 2 x 30 + 25
= 60 + 25
= 85