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ABC is a triangle in which AB = AC. Let ...

ABC is a triangle in which AB = AC. Let BC be produced to D. From a point E on the line AC let EF be a straight line such that EF is parallel to AB. Consider the quadrilateral ECDF thus formed. If `angleABC = 65^(@)` and `angleEFD = 80^(@)`, then what is `angle FDC` equal to ?

A

`43^(@)`

B

`41^(@)`

C

`37^(@)`

D

`35^(@)`

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The correct Answer is:
d
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LUCENT PUBLICATION-LINES AND ANGLES -EXERCISE 4A
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