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2x + 5 + 3x - 25 = 180
5x -20 = 180
5x = 180+20 = 200
x = 200/5
x = 40
CBD = 2(40)+5
= 80+5
= 85°
jenis sudut CBD = lancip , karena besarnya < 90°
5x = 180 - 5 + 25
5x = 200
x = 200/5
x = 40
CBD = 2x + 5
= 2(40) + 5
= 80 + 5
= 85 (lancip)