The document provides a list of pairs of angles that are either complementary or supplementary. It explains how to find the complement and supplement of given angles using basic equations. Examples include finding the complement of 20° and 57°, and the supplement of 105° and 87°.

9. S.NO. PAIR OF ANGLES COMPLEMENTARY
(90°)
SUPPLEMENTARY
(180°)
1. 69 , 21 ✔
2. 156 , 24 ✔
3. 33 , 147 ✔
4. 56 , 34 ✔
5. 111 , 69 ✔
6. 83 , 97 ✔
7. 161 , 19 ✔
8. 11 , 79 ✔

11. Find the complement of:
 1. Two angles are said to be
complementary if the sum
of their measures is 90o.
 The given angle is 20o
 Let the measure of its complement be xo.
 Then,
 x + 20o = 90o
 x = 90o – 20o
 x = 70o

12.  2. Two angles are said to be
complementary if the sum
of their measures is 90o.
 The given angle is 57o
 Let the measure of its complement be xo.
 Then,
 x + 57o = 90o
 x = 90o – 57o
 x = 33o

13. Find the supplement of:
 1. Two angles are said to be
supplementary if the sum
of their measures is 180o.
 The given angle is 105o
 Let the measure of its supplement be xo.
 Then,
 x + 105o = 180o
 x = 180o – 105o
 x = 75o

14.  2. Two angles are said to be
supplementary if the
sum of their measures is
180o.
 The given angle is 87o
 Let the measure of its supplement be xo.
 Then,
 x + 87o = 180o
 x = 180o – 87o
 x = 93o