Question

two sides of the triangle are 13cm and 14cm and it's semi-perimeter is 18cm then what will be the third side of the triangle? ​

Answer 1

side 1 =13 cm

side 2 =14 cm

perimeter = 2*18 cm = 36 cm

= side 1+ side 2+ side 3

=13 cm + 14 cm + side 3

= 27 cm + side 3

side 3 = 36 cm - 27 cm

side 3 = 9 cm

Answer 2

Hii..

Let a , b and c be the sides of the triangle

Given => a = 13 cm , b = 14 cm

and semi perimeter = 18 cm

Now , semi perimeter = (a+b+c)/2

=> 18 = (a+b+c)/2

=> a + b + c = 36

=> 13 + 14 + c = 36

=> 27 + c = 36

=> c = 36 - 27

=> c = 9

So , the length of third side ,i.e, c = 9 cm .

hope this helps !!

thank you ☺️