The NCERT math chapter 6 exercise 6.3 focuses on lines and angles, with a focus on important theorems and facts regarding parallel lines, transversal lines, alternate angles, corresponding angles, interior angles, and exterior angles.
NCERT CLASS 9 Maths Chapter 6 Exercise 6.3 Question No. 3
Page NO. 107
Please Provide me Explanation video.
Given that : AB||DE, therefore
∠CED = ∠BAC [∵ Alternate Angles]
⇒ ∠CED = 35°
In △CDE, ∠CED + ∠CDE + ∠DCE = 180°
⇒ 35° + 53° + ∠DCE = 180°
⇒ 88° = ∠DCE = 180°
⇒ ∠DCE = 180° – 88° = 92°