Question

The semi perimeter of a triangle is 10 cm and sum of its two sides is 13 cm, find the
length of the third side.
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Answer 1

Answer:

7cm

Step-by-step explanation:

S = a+b+c/2

S = a+13/2 = 10

a+13 = 20

a = 7cm

Answer 2

Answer:

7 cm

Step-by-step explanation:

Semi perimeter = perimeter /2

2 semi perimeter = perimeter

2*10=20cm

Sum of sides of triangle

a+b+c=20 cm

Here a+b=13

Then

13+c=20

c=20-13

c=7cm