#supplementaryangles#twoanglesaddto180#lesson10[br][br]Use the applet to practice finding the value of the missing supplementary angle.[br][br]Practice first before you answer the questions [br][br]You can change the value of <ACD (green angle) by moving or clicking on blue slider. Notice how the angle is named with points from the line and the vertex, C, is in the middle.[br][br]Find the missing supplementary angle ,<DCB, value and check your answers.[br][br]You should be able to teach how to find a missing supplementary angle value.