bhavana31 wrote:
Chethan92 wrote:
In any triangle, The third side should always be greater than the difference between the two sides and less than the sum of the other two sides.
12-7 < x < 19
5 < x < 19
perimeter = 7+12+x = 19+x
Only possible value is 9. 19+9 = 28.
Satisfies the condition.
B is the answer.
How can we say that only 9 could be the possible value. It could be anything between 6-18?
Since x can be anything from 6 to 18 we will check with the options.
1st go with the extreme values
let x= 6, so the perimeter will be 7+12+6= 25, so we cross out option A
Next let x = 18, 7+12+18= 37, cross out option C,D,E . hence we are left with option B.
I hope this made it easy for you to understand.
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