CLASS 7 Mathematics | LINES AND ANGLES – Chapter 5 | Extra Questions for Practice

Here are some practice problems for class 7 Maths chapter 5 Lines And Angles

Answer the following:

1. Find the complement of each of the following angles:

a) 30
b) 46

2. Find the supplement of each of the following angles:

a) 110
b) 75

3. Identify which of the following pairs of angles are complementary and which are supplementary:

a) 75,105
b) 120, 60
c) 70, 20
d) 130, 50

e) 45, 45

4. Classify the following angles as acute, obtuse, right, straight or reflex angles.

76, 135, 180, 245, 2 x 90, 32, 90, 125

5. Can two angles be supplementary if both of them are:

a) acute
b) obtuse
c) right

ANSWERS:

1. When the sum of the measures of two angles is 90 degree, the angles are called complementary angles.

a) Complement of 30 is 60 degree.
b) Complement of 46 is 44 degree.

2. When the sum of the measures of two angles is 180 degree, the angles are called supplementary angles.

a) Supplement of 110 is 70 degree.
b) Supplement of 75 is 105 degree.

3. a) 75 and 105 are supplementary angles.

b) 120 and 60 are supplementary angles.
c) 70 and 20 are complementary angles.
d) 130 and 50 are supplementary angles.
e) 45 and 45 are complementary angles.

4. 76 – Acute

135 – Obtuse
180 – Straight
245 – Reflex
2 x 90 – straight
32 – Acute
90 – Right
125 – Obtuse

5. a) No

b) No
c) Yes