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CBSE Class 9 Answered

In the figure ACCE and A:B :C = 3: 2: 1, find the value of ECD
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Let A, B and C be 3x, 2x and x respectively.

3x +2x +x = 180o     (angle sum of )
6x = 180o x = 30
       A = 90o, B = 60o and ACB =30o
Now, ACB + ACE + ECD = 180o (angles on a straight line)
 30o + 90o + ECD = 180o
 ECD = 180o – 120o = 60o
Hence, ECD = 60o
Answered by | 04 Jun, 2014, 03:23: PM

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