tolong jwb y buat bsk ni pake caranya y

Kesebangunan dan Kongruen

No.4
CD/AC = CE/BC
9/12 = 12/12+F
3/4 = 12/12+F
3(12+F) = 12 x 4
36 + 3F = 48
3F = 48 - 36
3F = 12
F = 12/3
F = 4 cm

No.5
6/6+4 = 3/X
6/10 = 3/X
3/5 = 3/X
3X = 3 x 5
3X = 15
X = 15/3
X = 5 cm

No.5
AE/AC = AD/AB
X/X+2 = 6/10
X/X+2 = 3/5
5X = 3(X+2)
5X = 3X + 6
5X - 3X = 6
2X = 6
X = 6/2
X = 3 cm

AD/AB = DE/BC
6/10 = y/10
3/5 = y/10
3 x 10 = 5y
30 = 5y
y = 30/5
y = 6 cm.

*semoga membantu. sukses selalu ^_^