Q16 of 78 Page 23

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

B as its two sides are equal and one angle is 90°

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

The number of isosceles triangles in the figure is

in Fig. 2.12,

∠BAC = 90° and AD ⊥ BC.

The number of right triangles in the figure is

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

The number of diagonals in a hexagon is _____.