Chapter 11: Constructions

EXERCISE 11.1

1. Construct an angles of 90° at the initial point of a given ray and justify the construction .

Solution:

2. Construct an angles of 45° at the initial point of a given ray and justify the construction .

3. Construction the angles of the following measurements :

     (i) 30°           (ii)

2212°

(iii) 15°

4. Construction the following angles and verify by measuring them by a protractor :

   (i) 75°                    (ii) 105°                  (iii) 135°

5. Construction an equilateral triangle , given its side and justify the construction .

EXERCISE 11.2