# Ex 3.3, 2 (iii) - Chapter 3 Class 8 Understanding Quadrilaterals

Last updated at Aug. 31, 2021 by

Last updated at Aug. 31, 2021 by

Transcript

Ex 3.3, 2 Consider the following parallelograms. Find the values of the unknowns x, y, z. (iii)Let the Parallelogram be ABCD where ∠BCO = 30° and ∠AOD = 90° Now, AC and BD intersect each other at O x = 90° In ∆BOC, Sum of all angles = 180° y + x + 30° = 180° y + 90° + 30° = 180° y + 120° = 180° y = 180° − 120° y = 60° Now, ABCD is a parallelogram ∴ AD ∥ BC and BD is a transversal , ∠ODA = ∠OBC z = y z = 60° Therefore, x = 90°, y = 60° and z = 60°

Ex 3.3

Ex 3.3, 1

Ex 3.3, 2 (i)

Ex 3.3, 2 (ii)

Ex 3.3, 2 (iii) Important You are here

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)

Ex 3.3, 4 Important

Ex 3.3, 5 Important

Ex 3.3, 6

Ex 3.3, 7 Important

Ex 3.3, 8 (i)

Ex 3.3, 8 (ii) Important

Ex 3.3, 9 Important

Ex 3.3, 10

Ex 3.3, 11

Ex 3.3, 12 Important

Chapter 3 Class 8 Understanding Quadrilaterals

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.