Question

5. Two sides of a triangle are 3 cm and 4 cm. Its perimeter is 12 cm. find the third side
of the triangle​

Answer 1

Answer:3+4=7

12-7 =

3 rd side =  5cm

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Answer 2

Solution :-

Here,

It is given that ,

Two sides of triangle are 3 cm and 4cm

Let the all sides of triangle be a, b and c

The measure of side a and b is 3cm and 4cm

Now,

As we know that,

Perimeter of triangle = Side + Side + Side

The perimeter of triangle = 12cm

Subsitute the required values,

12 = a + b + c

12 = 3 + 4 + c

12 = 7 + c

c = 12 - 7

c = 5

Hence, The third side of triangle is 5cm

Know more,

If the question is given like that,

Q) There is an equilateral triangle whose perimeter is 12cm then find the all three sides?

Sol) The sides of equilateral triangle are equal

Let the sides of equilateral triangle be x

Therefore,

12 = x + x + x

12 = 3x

x = 12/3

x = 4

Hence, The three sides of an equilateral triangle is 4cm, 4cm, 4cm $.$