Kunci Jawaban Matematika Kelas 9 dari Halaman 238 239 240 Semester 2 Lengkap! Materi Latihan 4.3

Cari AE.
AB/PQ = AE/PT
32/24 = AE/18
4/3 = AE/18
AE = 4/3 x (18)
AE = 24 cm

Cari ED
AB/PQ = ED/TS
32/24 = ED/21
4/3 = ED/21
ED = 4/3 x (21)
ED = 28 cm

Cari QR
AB/PQ = BC/QR
32/24 = 48/QR
4/3 = 48/QR
QR = 48 x 3/4
QR = 36 cm

4. Dua buah bangun di bawah ini sebangun. (lihat gambar di buku)

Hitunglah:
a. Panjang EF, HG, AD, dan DC.

Cari EF
FG/BC = EF/AB
28/35 = EF/20
4/5 = EF/20
EF = 4/5 x (20)
EF = 16 cm

Cari HG
HG = √(EF² + (28-16)²)
HG = √(16² + 12²)
HG = √(256 + 144)
HG = √400
HG = 20 cm

Cari AD
AD/EH = AB/EF
AD/16 = 20/16
AD/16 = 5/4
AD = 5/4 x (16)
AD = 20 cm

Cari DC
DC/HG = AB/EF
DC/20 = 20/16
DC/20 = 5/4
DC = 5/4 x (20)
DC = 25 cm

b. Nilai x, y dan z.