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Question 11 Mark
How many triangles can be drawn having its angles as 53°, 64° and 63°? Give reason for your answer.
Answer
None, the sum of given angles = 45° + 64° + 72° = 181° ≠ 180°.
Hence, we see that sum of all three angles is not equal to 180°. So, no triangle can be drawn with the given angles.
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Question 21 Mark
For what value of x + y in Fig. will ABC be a line? Justify your answer.

Answer
In the given figure, x and y are two adjacent angles.
For ABC to be a straight line, the sum of two adjacent angles x and y must be 180°
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1 Marks Question - Maths STD 9 Questions - Vidyadip