Question

Two sides of triangle are 10 cm,15 cm, the perimeter of triangle is 30 cm then find the third side of triangle​

Answer 1

Answer:

5 cm

Step-by-step explanation:

the sum of all sides called as the perimeter of and figure  

so, side 1 + side2+ side 3 = perimeter

let's the length of unknown side be X cm

then,

    10cm+15cm+Xcm= 30cm

    X =30cm-25cm

     X =5cm

Answer 2

Answer:

side a = 10cm

side b= 15cm

Let the length of the third side be x cm.

The length of the other two sides is 10 cm and 15 cm.

Now, the Perimeter of triangle = 30 cm

10 + 15 +x = 30

25+x=30

x=30-25

x=5cm

now for checking

10+15+5=30

30=30

so our answer is right

the third side of triangle measures 5 cm