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(3a+20)° + 2a° = 180°
5a+20° = 180°
5a = 180-20°
5a = 160°
a = 160:5
a = 32
<CBD = 2a° = 2(32) = 64°
24). <CBA + <ABC = 60°
(5x)° + (4x)° = 60°
9x = 60°
x = 60:9= 6.67 dibulatkan menjadi 6
<ABC = 4(6) = 24°
Maaf sepertinya yang nomor 23 itu tidak ada jawabannya