Question

What is the semi-perimeter of a triangle if the sides are 6cm, 9cm and
5cm respectively.​
a) 6cm b) 9cm c) 10cm d) 20cm

Answer 1

Answer:

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Step-by-step explanation:

Given s−a=8cm⋯(1)

s−b=7cm⋯(2)

s−c=5cm⋯(3)

Where a, b, c are sides of triangle

s2 is 1 semi perimeter ie s=2a+b+c

(1) + (2) + (3)

⇒3s−(a+b+c)=20cm

⇒3s−(25)=20cm

⇒s=20cm

Area of triangle =s(s−a)(s−b)(s−c)

=20(8×7×5)=5600=2014=59cm