Question

Two sides of a triangle are 7 cm and 13cm, and its semi-perimeter is 16 cm. Then, third side of the triangle is ____________.​

Answer 1

Answer:

12 cm

Step-by-step explanation:

Semiperimeter - half of perimeter

16=½ × 13+7+x

16=½× 20+x

16=10+x

x=6*2

x=12

Answer 2

Answer:

Let a = 7cm , b= 13cm ,c = xm

We know that

s = a+b+x/2

16 = 7+13+x/2

16×2 = 7+13+x

32 = 20+x

x= 32-20

x=c= 12cm

third side of the triangle is 12cm