ka tolong di jawab ya

a.
∠BDE = ∠ABC
∠DEC = ∠BCA
∠DAE = ∠BAC

b.
AB dan AD
DE dan BC
AC dan AE

c.
misalkan BD = a
AD / AB = DE / BC
(4+a) / 4 = 9 / 6
6(4 + a) = 9 x 4
24 + 6a = 36
6a = 36 - 24
6a = 12
a = 2

maka
BD = a = 2 cm
AD = AB + BD = 4cm + 2 cm = 6 cm

d.
misal AC = x
AE / AC = DE / BC
(3+x) / x = 9 / 6
6(3 + x) = 9 x
18 + 6x = 9x
9x - 6x = 18
3x = 18
x = 6 cm