Question

the perimeter of a triangular sheet of paper is 31cm.its shortest side is 5cm and its longest side is thrice of the shortest side.find the length of the third side.​

Answer 1

Answer: 11cm

Step-By-Explanation:

Perimeter=31cm

Shortest side= 5cm

Longest side= 3x shortest side

=3x5=15cm

Let the third side be = x

Perimeter of triangle= a+b+c

31cm =5+15+x

31cm =20+x

31-20 =x

11cm =x

So x=11cm

Answer 2

Answer:

11 cm

Step-by-step explanation:

perimeter of triangle = p

shortest side = 5 cm = a

longest side = 5×3 =15 cm =b

third side = ? = c

p = a+b+c

31 cm = 5 +15 +c

31 cm = 20 +c

c= 31 -20

c= 11 cm

third side =11 cm

HOPE THIS WILL HELP YOU