1.

In the above figure (not to scale), E and F are the mid points of AB and CD respectively. `bar(AB) | |bar(CD),bar(BC)||bar(AD),/_ADE =70^(@)`, AND `/_BCE =40^(@), /_DEC` isA. `70^(@)`B. `40^(@)`C. `110^(@)`D. `120^(@)`

Answer» Correct Answer - c
(i) Join E and F . Alternate angles are equal.
(ii) Draw a line parallel to `bar(AD)` and `bar (BC)` through E and F.
(iii) Find angles CEF and DEF using alternate angles property .
(iv) The sum of above is `/_ DEC`.


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