Question

The semiperimeter of a triangle having a length of its side as 20cm, 15cm, and 9cm is

Answer 1

Answer

Semi perimeter of the traingle is 22 cm.

Step by Step Explanation :

Given sides of the triangle are 20 cm, 15 cm & 9 cm.

We've to find the semi perimeter of the traingle.

By using Formula :

$\star \ \boxed{\sf{\purple{S_{(semi perimeter)} = \dfrac{a + b + c}{2}}}}$

• a = 20
• b = 15
• c = 9

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☯ Substituting values in the formula ;

$:\implies\sf S = \dfrac{a + b + c}{2} \\\\\\:\implies\sf S = \dfrac{20 + 15 + 9}{2} \\\\\\:\implies\sf S = \dfrac{\cancel{44}}{\cancel{\: 2}}\\\\\\:\implies\boxed{\sf{\purple{S_{(semi perimeter)} = 22}}}$

${\therefore} \: \underline{\sf{Semi perimeter \ of \ the \: \triangle \ is \ 22 \ cm.}}$

Answer 2

Answer:

the right answer is 22 cm

Step-by-step explanation:

Let a=20cm,b=15cm,c=9cm

And semi-perimeter =S

Now, S=2a+b+c=220+15+9=244=22cm

∴  Semi-perimeter of triangle is 22cm.

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