Q24 of 78 Page 23

Number of angles less than 180° in Fig. 2.17 is ______ and their names are __________.

12

∠OAB, ∠OBA, ∠AOB, ∠AOC, ∠OAC, ∠OCA, ∠OCD, ∠COD, ∠ODC, ∠BAC, ∠DCA, ∠DOB.


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22

In Fig. 2.16,


(a) ∠AOD is a/an _____ angle


(b) ∠COA is a/an _____ angle


(c) ∠AOE is a/an _____ angle

 23

The number of triangles in Fig. 2.17 is ______.

Their names are _______.

 25

The number of straight angles in Fig. 2.17 is _____.

 26

The number of right angles in a straight angle is _____ and that in a complete angle is_____.