
9th class lines and angles
Authored by Shashank Raturi
Mathematics
9th Grade
Used 1+ times

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8 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
If two lines intersect, then how many angles are formed? (1 mark)
यदि दो रेखाएँ एक-दूसरे को प्रतिछेदित करती हैं, तो कितने कोण बनते हैं? (1 mark)
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
In given Fig., if AB || CD || EF, PQ || RS, ∠RQD = 25° and ∠CQP = 60°, then
∠QRS is equal to. (1 mark)
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
The angles of a triangle are in the ratio 5:3:7. The triangle is (1mark)
(A) an acute angled triangle
(B) an obtuse angled triangle
(C) a right triangle
(D) an isosceles triangle
त्रिभुज के कोणों का अनुपात 5 : 3 : 7 है। यह त्रिभुज है – (1 mark)
(A) तीक्ष्ण कोण त्रिभुज
(B) स्थूल कोण त्रिभुज
(C) समकोण त्रिभुज
(D) समद्विबाहु त्रिभुज
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4.
OPEN ENDED QUESTION
3 mins • 1 pt
True/False – Can a triangle have all angles less than 60° or two obtuse angles? Give reason. (2 marks)
सही/गलत - क्या किसी त्रिभुज के सभी कोण 60° से छोटे हो सकते हैं या दो कोण स्थूल हो सकते हैं? अपने उत्तर का कारण बताइए। (2 marks)
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5.
OPEN ENDED QUESTION
3 mins • 1 pt
In Fig., OD is the bisector of ∠AOC, OE is the bisector of ∠BOC and OD ⊥ OE. Show that the points A, O and B are collinear. (3 marks)
चित्र में, OD ∠AOC का समद्विभाजक है, OE ∠BOC का समद्विभाजक है और OD ⊥ OE है। सिद्ध कीजिए कि बिंदु A, O और B सह-रेखीय हैं। (3 marks)
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6.
OPEN ENDED QUESTION
3 mins • 1 pt
In Fig., BA || ED and BC || EF. Show that ∠ABC = ∠DEF. [Hint: Produce DE to intersect BC at P (say)]. (3 marks)
चित्र में, BA || ED and BC || EF. दिखाइए, ∠ABC = ∠DEF. [संकेत: DE को बढ़ाकर BC को P पर काटिए (मान लीजिए)।] (3 marks)
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7.
OPEN ENDED QUESTION
3 mins • 1 pt
A triangle ABC is right angled at A. L is a point on BC such that AL ⊥ BC. Prove that
∠ BAL =∠ ACB. (3 marks)
दिया गया है, △𝐴𝐵𝐶 समकोण त्रिभुज है जहाँ A पर कोण 90∘ है। L बिंदु BC पर ऐसा है कि AL ⊥ BC. प्रमाण करना है, ∠BAL=∠ACB. (3 marks)
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