Question

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Answer 1

12.Consider triangle ABC where AD is median

The diagram is attached below

We will be using the property of triangle which says SUM OF TWO SIDES OF TRAINGLE IS ALWAYS GRATER THAN THIRD SIDE.

Considering triangle ABD  

Using above property of triangle related to relation between sum of two sides and third side we can say that  

AB + BD > AD     --------(1)

Considering triangle ACD  

Using above property of triangle related to relation between sum of two sides and third side we can say that  

AC + DC > AD     --------(2)

On adding equation (1) and (2) , we get  

(AB + BD) + ( AC + DC ) > AD + AD  

=> AB + ( BD + DC ) + AC > 2AD

=> AB + BC + CA > 2AD

13. P=116cm

Answer 2

Answer:

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