Q15 of 78 Page 23

in Fig. 2.12,

∠BAC = 90° and AD ⊥ BC.


The number of right triangles in the figure is


BAC, ADC, ADB

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A polygon has prime number of sides. Its number of sides is equal to the sum of the two least consecutive primes. The number of diagonals of the polygon is

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In Fig. 2.11, AB = BC and AD = BD = DC.

The number of isosceles triangles in the figure is


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In Fig. 2.13, PQ ⊥ RQ, PQ = 5 cm and QR = 5 cm. Then ∆ PQR is

 17

An angle greater than 180° and less than a complete angle is called ______.