# Ex 3.3, 10 - Chapter 3 Class 8 Understanding Quadrilaterals

Last updated at Jan. 19, 2023 by Teachoo

Ex 3.3

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Ex 3.3, 2 (ii)

Ex 3.3, 2 (iii) Important

Ex 3.3, 2 (iv)

Ex 3.3, 2 (v) Important

Ex 3.3, 3 (i) Important

Ex 3.3, 3 (ii)

Ex 3.3, 3 (iii)

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Ex 3.3, 8 (i)

Ex 3.3, 8 (ii) Important

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Ex 3.3, 10 You are here

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Ex 3.3, 12 Important

Chapter 3 Class 8 Understanding Quadrilaterals

Serial order wise

Last updated at Jan. 19, 2023 by Teachoo

Ex 3.3, 10 Explain how this figure is a trapezium. Which of its two sides are parallel? Given: A quadrilateral KLMN having ∠L = 80° and ∠M = 100° To Prove: KLMN is a trapezium. i.e. KL ∥ NM Construction: Extend LM to O. Proof: For Line Segments NM and KL, with MO is a transversal . ∠ M + ∠ L = 180° Thus, Sum of Interior angles on same side of transversal is 180° Which is only possible if NM and KL are parallel lines Therefore, NM ∥ KL Since, KLMN is quadrilateral with KL ∥ NM ∴ KLMN is a trapezium