Question

Two sides of a triangle are 2.6 cm and 5.4 cm. The perimeter of the triangle is 15 cm. Find the third side.​

Answer 1

Let us take the third side as x

15 - 5.4 + 2.6 = x

15 - 8 = x

7 = x

x = 7

Answer the third side is 7cm

Answer 2

$\rm 7 \: cm$

Step-by-step explanation:

$\rm \red{Given:-}$

length of 2 sides and perimeter

$\rm \red{Asked:-}$

length of 3rd side

$\rm \red{Solution:-}$

$\rm a+b+c = 15$

$\rm 2.6+5.4+c = 15$

$\rm 8+c = 15$

$\rm c = 15-8$

$\rm c = 7$