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Q.

State true or false.


If a straight line falling on two straight lines makes the interior angles on the same side of it, whose sum is 120  , then the two straight lines, if produced indefinitely. meet on the side on which the sum of angles is less than 120  .


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a

True

b

False 

answer is A.

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Detailed Solution

Given three straight lines and sum of interior angles on the same side = 120  .
Question ImageFrom the above figure, lines AB and CD cannot meet with each other because the sum of base angles is exceeding the limit of 180°.
So, the line will be able to meet on the side of AE and CF because the sum of the base angles is equal to 120° which is x+y=120°   and less than 180°.
The meeting side of the straight lines will be on that side which provides sum of its angles as 120   or < 120  .
Therefore, the statement is true.
Hence, option (1) is correct.
 
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State true or false.If a straight line falling on two straight lines makes the interior angles on the same side of it, whose sum is 120 ∘  , then the two straight lines, if produced indefinitely. meet on the side on which the sum of angles is less than 120 ∘  .