Question

3. Find the possible lengths of the three sides of triangles whose Perimeter is 21cm
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Answer 1

Solution:

Perimeter of triangle = 21 cm

So, the sum of the lengths of the sides = 21 cm

so, there are infinite possibilities for the lengths of sides ,

For eg, 1)   7 cm , 7 cm , 7 cm

          or 2)   10 cm , 9 cm , 2 cm

          or 3)  8 cm, 8 cm , 5 cm....... etc

( Also remember for a valid triangular figure sum of lengths of any two sides should always be greater than the third one)

Answer 2

Answer:

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Step-by-step explanation:

We know that perimeter of triangle is a +b+c= 21

Suppose it is an equilateral triangle, then

3a =21

a = 21/7

a = 3