Question

find the semi perimeter of a triangle having sides 15cm, 20cm &35cm.
a.)70cm.
b.) 30cm. c.)60cm. d.) 35cm
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Answer 1

Answer:

A.

Solution: 15+20+35=70cm.

Answer 2

Answer:

b) 30 cm

The semi perimeter of a triangle is 30 cm.

Step-by-step explanation:

Given : A triangle having sides 15 cm , 20 cm and 25 cm.

Solution :

The semi perimeter of a triangle is

s=\frac{a+b+c}{2}s

= 2

a+b+c

where, the sides of triangle is

a=15 cm, b=20 cm and c=25 cm

Substitute in the formula,

s=\frac{15+20+25}{2}s

= 2

15+20+25

s=\frac{60}{2}s

= 2

60

s=30s=30

Therefore, the semi perimeter of a triangle is 30 cm.