दी गई आकृति में BC=a, CD= b, तथा AD =c य...

दी गई आकृति में BC=a, CD= b, तथा AD =c यदि `angleC=angleD =40^(@)` तब DE के मान के लिए निम्न में कौन सत्य होगा?

A

`(ab)/(b+c)`

B

`(ac)/(a+c)`

C

`(bc)/(a+b)`

D

`(ac)/(b+c)`

लिखित उत्तर

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The correct Answer is:

4

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