Which of the following pair of angles are supplementary?
101o, 39o
101o, 79o
141o, 179o
121o, 149o
Since 101o + 79o = 180o, so they are supplementary.
If a + 10o, 3a + 10o, 5a - 10o and 3a - 10o are the angles of a quadrilateral, then what is the value of a?