Question

in the figure below aob is a straight line.calculate the measure of cod​

Answer 1

Answer:

∠COA + ∠COD + ∠DOR = 180 degrees ( sum of angles on an adjacent line = 180 degrees)

x + 20 + 2x -20 + 60 = 180

3x + 60 = 180

3x = 120

x = 40

Therefore ∠COD = 2(40) - 20 = 80 - 20 = 60 degrees