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Verified answer
Nomer 1AB = 30
AD : DB = 2 : 3
didapat
AD = 2x
DB = 3x
dengan x adalah sembarang bilangan
AB = AD + DB
30 = 2x + 3x
30 = 5x
x = 30 : 5
x = 6
maka panjang
AD = 2(6) = 12
DB = 3(6) = 18
nomer 5
<ABC + <CBD = 180
7x + 2x = 180
9x = 180
x = 180 : 9
x = 20
<ABC
= 7x
= 7(20)
= 140
<CBD
= 2x
= 2(20)
= 40
sudut pelurus <DBC
= <ABC
= 140