In a triangle , the length of the first side is 5 cm less than the length of the second side . The length of the third side is 7 cm more than the length of the first side if the first side is of length is 18 cm , then what is the semiperimeter of the triangle?
Answers
In a triangle , the length of the first side is 5 cm less than the length of the second side . The length of the third side is 7 cm more than the length of the first side if the first side is of length is 18 cm .
Need To Find : Semi-Perimeter of Triangle .
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❒ Let's consider A , B & C be the three sides of Triangle.
⠀⠀⠀⠀⠀Finding Sides of Triangle :
First Side or A of Triangle :
First Side or A of Triangle is 18 cm . [ Given That ]
Second Side or B of Triangle :
Given that ,
The length of the first side is 5 cm less than the length of the second side .
Then ,
Second Side = First Side + 5
Or ,
Second Side = 18 + 5
Second Side = 23 cm
Therefore,
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Third Side or C of the Triangle :
Given that,
The length of the third side is 7 cm more than the length of the first side
Then ,
Third Side = First Side + 7
Or ,
Third Side = 18 + 7
Third Side = 25 cm .
Therefore,
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Thus ,
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⠀⠀⠀⠀⠀ Finding Semi-Perimeter of Triangle :
Where,
A , B & C are three sides of Triangle.
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Therefore,
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Answer:
s=a+b+c/2
25+18+23/2=66/2=33
Step-by-step explanation: