Jawaban:

1. a) 12cm

b) 4cm

c) 6cm

2. a) 8cm

b) 15cm

c) 12cm

Penjelasan dengan langkah-langkah:

1. a) CD/CA=DE/AB

8/8+AD = 12/18 => sederhanain

8/8+AD= 2/3

2(8+AD) = 3×8

16+2AD = 24

2AD = 24-16

AD = 8/2

AD = 4cm

CA= 8+4=12cm

b) AD = 4cm

c) CE/CB = DE/AB

CE/6+CE = 12/18 => sederhanakan

CE/6+CE = 2/3

2(6+CE) = 3CE

12+2CE = 3CE

12 = 3CE-2CE

12 = CE

2. a) PT = 12 - 8 = 8cm -> ini sinpelnya aja ya

b) QR/ST = PR/PT

QR/10 = 12/8 => sederhanakan

QR/10 = 3/2

2QR = 10×3

QR = 30/2

QR = 15cm

c) PS/PQ = PT/PR

PS/6+PS = 8/12

2(6+PS) = 3 PS

12+2PS = 3PS

12 = 3PS-2PS

12 = PS

semoga membantu