sudut ECB + sudut CBD = 180°
x + 2x = 180
3x = 180
x = 180/3
x = 60
sudut CBD = 2x
= 2 . 60
= 120
180 = x + 2x
180 = 3x
60 = x
cbd = 2x maka 2x60= 120
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sudut ECB + sudut CBD = 180°
x + 2x = 180
3x = 180
x = 180/3
x = 60
sudut CBD = 2x
= 2 . 60
= 120
180 = x + 2x
180 = 3x
60 = x
cbd = 2x maka 2x60= 120