Q10 of 78 Page 23

The number of triangles in Fig. 2.10 is

1 is the bigger equilateral triangle, then there are 4 other smaller equilateral triangle and then the altitude makes 2 new big right angle triangles and 2 smaller and 1 large triangle on each side.

total 13 triangles

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8

The number of angles in Fig. 2.8 is

 9

The number of obtuse angles in Fig. 2.9 is

 11

If the sum of two angles is greater than 180°, then which of the following is not possible for the two angles?

 12

If the sum of two angles is equal to an obtuse angle, then which of the following is not possible?