**New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Pairs and Angles Self Practice 9A Solution**

**(1) What is measure of complement of 38 ^{0}**

**(2) What is measure of supplement of 170 ^{o}**

**(3) Tell whether the angles shown below are complementary, supplementary or neither.**

** (4) For each angle in group A, find its complement in group B. (Example 20 ^{o} and 70^{o})**

**A: 20 ^{o}, 10^{o}, 35^{o}, 45^{o}, 60^{o}, 85^{o}, 65^{o}**

**B: 25 ^{o}, 45^{o}, 30^{o}, 5^{o}, 70^{o}, 80^{o}, 55^{o}**

**Solution from 1 to 4:**

**(5) For each angle in group A, find its supplement in group B.**

**A: 140 ^{o}, 70^{o}, 179^{o}, 165^{o}, 55^{o}, 45^{o}, 80^{o}**

**B: 100 ^{o}, 15^{o}, 125^{o}, 110^{o}, 1^{o}, 40^{o}, 135^{o}**

**(6) Two complementary angles are in the ratio 7:8, find the angles.**

**Solution 5 & 6:**

**(7) Two supplementary angles are in the ratio 3:7, Find the angles.**

**(8) Tell whether the angles are only adjacent, adjacent and form a linear pair or not adjacent.**

**(a) <1 and <4**

**(b) <2 and <3**

**(c) <3 and <4**

**(d) <3 and <1**

**Solution 7 & 8:**

**(9) Find the measures of the lettered angles.**

**Solution Number 9 to 14:**

**(15) In the diagram on the right, <1 = 50 ^{0} and <2 = 84^{0}, find the measures of <3, <4, <5 and <6.**

**Solution Number 15:**

**(16) Find the angles in each of the following.**

**(a) The angles are supplementary and the larger is 20 ^{0} less than 3 times the smaller.**

**(b) The angles are complementary and the larger is 15 ^{o} more than twice the smaller.**

**(c) The angles are adjacent and form an angle of 120 ^{o}. The larger is 20^{o} less than 3 times the smaller.**

**(d) The angles are vertical and complementary.**

**Solution Number 16:**