Question

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

• A. $44$ cm
• B. $21$ cm
• C. $22$ cm
• D. $24$ cm

Answer 1

Answer: (C)

$22$ cm

Let $a=20cm,b=15cm,c=9cm$

And semi-perimeter $=S$

Now, $S=\frac{a+b+c}{2}=\frac{20+15+9}{2}=\frac{44}{2}=22cm$

$\therefore$ Semi-perimeter of triangle is $22cm$.