Question

the perimeter of a triangle is 4k + 9 that if two of its sides are K + 2 and 2k+ 6 respectively find its third side

Answer 1

let the third side be x
perimeter of triangle= 4k +9
k+2 +2k+6 + x =4k +9
x= k+1

Answer 2

A perimeter of triangle is sum of all its sides..therefore applying the formula,
A/Q
Perimeter of a triangle = 4k+9
Let the third side be x,
then,
k+2+2k+6+x=4k+9
3k+8+x=4k+9
x=4k+9-3k-8
x=k+1
Third side=k+1