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In the above figure (not to scale), E an...


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` is

A

`70^(@)`

B

`40^(@)`

C

`110^(@)`

D

`120^(@)`

Text Solution

Verified by Experts

The correct Answer is:
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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