khominghoo
18. keliling alas = 16 cm p = 3l k = 2 x ( p + l ) k/2 = 3l+l 16/2 = 4l l = 8/4 = 2cm p = 3x2 = 6 cm t = 5cm Lp = 2 x (pxl + lxt + pxt ) = 2 x (6x2 + 2x5 + 6x5) = 2 x 52 = 104 cm² jawaban : A
19. t.tabung = 3t.kerucut t.t = 3tk Tinggi bangun = t.t + tk 24 = 4t.k t.k = 24/4 = 6 cm t.t = 3x6 = 18 cm
keliling = πd 44 = 22/7 x d d = 44x7/22 = 14 cm r = 14/2 = 7 cm
Volume = πr²t.t + πr².tk/3 = 22/7 x 7² x ( 18 + 6/3) = 154 x 20 = 3.080 cm³ jawaban : A
20. f(x) = mx + n f(5) = 5m + n = 3 f(3) = 3m + n = -1 =============== -- 2m = 4 m = 4/2 m = 2 5m + n = 3 5x2 + n = 3 n = 3 - 10 n = -7
p = 3l
k = 2 x ( p + l )
k/2 = 3l+l
16/2 = 4l
l = 8/4 = 2cm
p = 3x2 = 6 cm
t = 5cm
Lp = 2 x (pxl + lxt + pxt )
= 2 x (6x2 + 2x5 + 6x5)
= 2 x 52 = 104 cm²
jawaban : A
19. t.tabung = 3t.kerucut
t.t = 3tk
Tinggi bangun = t.t + tk
24 = 4t.k
t.k = 24/4 = 6 cm
t.t = 3x6 = 18 cm
keliling = πd
44 = 22/7 x d
d = 44x7/22 = 14 cm
r = 14/2 = 7 cm
Volume = πr²t.t + πr².tk/3
= 22/7 x 7² x ( 18 + 6/3)
= 154 x 20
= 3.080 cm³
jawaban : A
20. f(x) = mx + n
f(5) = 5m + n = 3
f(3) = 3m + n = -1
=============== --
2m = 4
m = 4/2
m = 2
5m + n = 3
5x2 + n = 3
n = 3 - 10
n = -7
f(x) = 2x -7
f(0) = 2(0) -7
f(0) = -7
jawaban : A