Quadrilaterals - NCERT Exercise 8.1 (Question 1 to 4) | Class 9 Maths Chapter 8

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Sir I have doubt like i always confused while choosing triangles could u please tell can we choose any triangles

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you have to choose the triangles according to what you have to prove.

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can we congurent q3 like in triangle aod and doc od = do ( common ) angle AOD= DOC ( each 90 ) ao=oc ( given )

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Sir can I right 'co.interior' instead of ' interior angles on the same side of a transversal ' in ques 2

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Thanks for your kind words! We are glad that our videos helped you prepare for your maths paper. We wish you all the best for your exams. Keep learning with us!

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Sir ..... in question 2 ......is it necessary to prove it by proving one angle 90⁰ or we can use other properties of rectangle like proving two sides equal ....?

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Thank you for asking such a great question! Yes, you can prove it by using other properties of a rectangle such as proving two sides equal. However, proving that one angle is 90 degrees is a great way to prove that it is a rectangle!

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Sir....can we write directly that AOB plus BOC = 180°(linear pair of angle)...without any congruency??

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Hi there! Great question! Yes, you can write that AOB plus BOC = 180° without any congruency, as you are simply stating the relationship between the two angles. Thanks for watching our videos!

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If your question is different from the one given in the video and you have used a different theorem to solve it, and if your answer is correct, then you will get marks in the exam.

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I want to say that ki ques no. 2 me ap dono triangles ko divide krke dikhaye usme pehla triangle Abc hoga and dusra ADC toh fir ap common me AB =BA kyu common likhe

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Not sides ,, all four angles are of 90

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42:19

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