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(2x + 5) + (3x - 25) = 180
2x + 5 + 3x - 25 = 180
5x - 20 = 180
5x = 180 + 20 = 200
x = 200/5
x = 40°
besar sudut CBD = 2x + 5 = 2(40) + 5 = 85°
maka sudut CBD termasuk sudut lancip karena 85°< 90°