Page 150 - New Medley 5 Semester 2

Constructing an Angle of 90°

We can also construct an angle of 90° following the similar steps as we
follow earlier.

1. Draw a ray PQ.
P Q

2. Mark a point R with 90° marking.

R

3. Draw a ray PR. Thus, ∠QPR = 90°.

P Q
C
Note that the two lines forming 90° angle are called

perpendicular to each other. Here, AB and CD are
perpendicular to each other.
The symbol ‘⊥’ is used for representing ‘perpendicular A O B

to’. Thus, AB ⊥ CD.
D
EXERCISE 6.3

A. Check whether the given angles make a pair of complementary angles.

1. 90°, 0° 2. 85°, 95° 3. 40°, 50° 4. 15°, 165°

5. 45°, 45° 6. 10°, 80° 7. 60°, 30° 8. 25°, 75°
B. Check whether the given angles make a pair of supplementary angles.

1. 0°, 180° 2. 90°, 110° 3. 80°, 120° 4. 99°, 81°

5. 30 °, 60° 6. 80°, 100° 7. 45°, 135° 8. 105°, 75°

C. Find the complement of each of the following.
1. 0° 2. 55° 3. 5° 4. 63°

5. 50° 6. 80° 7. 90° 8. 45°

D. Find the supplement of each of the following.
1. 180° 2. 90° 3. 60° 4. 135°
5. 70° 6. 85° 7. 112° 8. 155°

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