Jawabanmu

2014-06-15T21:31:34+07:00
AB = 21 cm
BC = 20 cm
AC = √21²+20² = √441+400 =√841 = 29 cm
AD = 25 cm (t prisma)

luas alas dan tutup = 2 x luas segitiga = 2 x 21 x20/2= 420

L sisi 1 = 21x25 = 525
L sisi 2 = 20x25 = 500
L sisi 3 = 29x25 = 725

Luas slimut = 420 + 525+500+725 = 2170