Question

Two sides of a triangle are 5 cm and 4 cm.
The perimeter of the triangle is 12 cm. The
third side has length.Find.​

Answer 1

Answer:

Step-by-step explanation:

perimeter of triangle=a+b+c

a=5

b=4

5+4+c=12

9+c=12

c=3

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Answer 2

Ans:

The third side of triangle is 3cm.

Step-by-step explanation:

In the question, we are given perimeter of triangle and two sides of triangle.

We know the formula of perimeter of triangle is sum of all sides ( a + b + c ).

The perimter of triangle = 12cm.

The two sides of triangle are = 5cm and 4cm.

Suppose the third side = x

let's apply formula of perimeter of triangle to find out the third side of triangle.

Perimeter of triangle = a + b + c

                        12cm   = 5cm + 4cm + x

                        12cm    = 9cm + x

                         9cm + x = 12cm

                          x = 12cm - 9cm

                         x = 3cm

        The third side of triangle is 3cm.

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