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CD/AC = DE/AB
3/5 = p/4
5p = 12
p = 12/5
p = 2.4 cm
CE/CB = DE/AB
4/4 + q = 2,4/4
2,4(4 + q) = 4 x 4
9.6 + 2,4q = 16
2,4q = 16 - 9.6
2,4q = 6.4
q = 6.4/2,4
q = 2,67 cm
bagian c
<A = <D = 80
<E = <B = 180 - 80 - x = 100 - x
bagian b
CD/AC = CE/CB = DE/AB
bagian a
Iya sebangun, karena segitiga segitiga tersebut memiliki sudut dan sisi yang sama panjang