ABCD is a trapezium in which `AB ||CD, AB =20cm, BC =10` cm, `CD =10` – InterviewSolution

1.	ABCD is a trapezium in which `AB \|\|CD, AB =20cm, BC =10` cm, `CD =10` cm and `AD =10` cm . Find `/_ADC`A. `80^(@)`B. `100^(@)`C. `120^(@)`D. `140^(@)`
Answer» Correct Answer - c (i) Draw lines parallel to AD and BD passing through C and D respectively cutting AB at E (say). AECD and EBCD would be parallelogram. (ii) Draw lins throug D and C parallel to BC and AD. Cutting AB at M and N respectively such that ANCD and MBCD form parallelograms. (iii) Triangles ADM and CBN form equilateral triangles, using these results find the required angle.

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