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(c)
cari sisi lain dari segitiga itu
x =
= √225 = 15cm
luas permukaan segitiga = 2. luasΔ + luas sisi 1+ 2luas sisi 2
= 216cm²
luas permukaan(Lp) 1 = 18.35 = 630cm²
lp2= 2 x 15.35 = 1.050cm²
luas permukaan prisma = 216 + 630 + 1.050 = 1896 cm²
(d)
lp = 2(p.l) + 2(p.t) + 2(l.t)
= 2(8.6) + 2(8.15) + 2(6.15)
= 2.48 + 2.120 + 2.90
= 96 + 240 + 180
= 516cm²
3.
(a)
panjang sisi belah ketupat = 4 x 40 cm
(b)
luas alas(la) = 96cm²
(c)
lp = 2.la + pjg semua sisi belah ketupat x tinggi
= 2.96 + 40.18
= 192 + 720
= 912 cm²
4.
panjang = la/l
p = 24/4
p = 6cm
lp = 2(p.l) + 2(p.t) + 2(l.t)
= 2(6.4) + 2(6.10) + 2(4.10)
= 2(24) + 2(60) + 2(40)
= 48 + 120 + 80
= 248 cm²
5.
tinggi trapesium = √91cm
lp = 2.la + luas sisi tegak + lst + lst
= 2. + 10.4.2 + 8.4 + 14.4
= 22√91 + 80 + 32 + 56
= (168 + 22√91) cm ²