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Q.

The semi perimeter of a triangle having the length of its sides as 20 cm, 15 cm and 9 cm is: 


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a

44 cm

b

21 cm

c

22 cm

d

24 cm 

answer is C.

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Detailed Solution

Perimeter of the triangles is denoted as P:
Question ImageQuestion ImageThe semi-perimeter of triangle is generally denoted as S and is given by,
Question ImageGiven three sides of the triangle as: 20 cm, 15 cm and 9 cm
That is, Question ImageThe semi-perimeter of the triangle is:
Question ImageSemi-perimeter of triangle: Question ImageHence, Option (3) is the correct answer.
  
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