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4. Angles, Lines and Triangles
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Q6 of 153 Page 129

In the given figure, AB||CD. Find the value of x.

X=110


Given AB||CD, ∠DCE = 130° and ∠AEC = 20°


Draw a line EF||AB||CD



CD||EF


Therefore, ∠DCE + ∠CEF = 180°


⇒ 130° + ∠1 = 180°


⇒ ∠1 = 180° - 130°


⇒ ∠1 = 50°


AB||EF


Therefore, ∠BAE + ∠AEF = 180°


⇒ x + ∠1 + 20° = 180°


⇒ x + 50° + 20° = 180°


⇒ x = 180° - 70°


⇒ x = 110°


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Questions · 153
4. Angles, Lines and Triangles
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