Tolong ya nomor 10-12.makasih

10. TQ = (x+3) cm
TU = 4 cm
PQ = 4 + (x+3) = (x+7) cm
PR = 6 cm
x . . . ?
=> QT/TU = PQ/PR
=> (x+3)/4 = (x+7)/6
=> 6(x+3) = 4(x+7)
=> 6x+18 = 4x+28
=> 6x-4x = 28-18
=> 2x = 10
=> x = 5 cm
Jawaban : A

11. BC = x
AB = 6 cm
CD = (x+4) cm
DE = 9 cm
BC . . . ?
=> BC/AB = CD/DE
=> x/6 = (x+4)/9
=> 9x = 6(x+4)
=> 9x = 6x+24
=> 9x-6x = 24
=> 3x = 24
=> x = 8 cm
Jawaban : D

12. AO = 4 cm
CO = x cm
AB = 12 cm
CD = (x+10) cm
CO . . . ?
=> AO/CO = AB/CD
=> 4/x = 12/(x+10)
=> 12x = 4(x+10)
=> 12x = 4x+40
=> 12x-4x = 40
=> 8x = 40
=> x = 5 cm
Jawaban : B