Question

the semi perimtre of a triangle having side 18cm, 19cm, 20cm is:​

Answer 1

Answer:

Step-by-step explanation:

sides of triangle = 18cm , 19cm , 20cm

semi perimeter = a + b + c

                                  2

semi perimeter = 18 + 19 + 20  

                                   2

semi perimeter = 28.5 cm

Answer 2

Step-by-step explanation:

Given that,

Triangle has length of its sides as 18 cm, 19 cm and 20 cm

We have to find the semiperimeter of triangle

For a triangle having sides of length a, b, and c, the semiperimeter of triangle is given as:

s = 1/2 (a + b + c)

From given information,

a = 18 cm

b = 19 cm

c = 20 cm

Substituting the values in above formula,

s = 1/2 (18 + 19 + 20)

s = 1/2 * 57

s = 28.5