Question

find the value of c if in a triangle s=13 a=8 and b=7​

Answer 1

Correct answer of $c = 11$

Explanation:

Given that,

Semi perimeter of triangle $(S) = 13$

$a = 8$

$b = 7$

$c =$?

As we know that,  

Semi perimeter of triangle(Hero's formula) $S = \frac{(a+ b +c)}{2}$

$a+ b +c = 2S$

$8 + 7 + c = 2\times13$

Correct answer of $c = 26 - 15 = 11$

Answer 2

The value of c is 11.

Step-by-step explanation:

Given : In a triangle s=13 a=8 and b=7​.

To find : The value of c ?

Solution :

We know the semi perimeter of the triangle is given by,

$s=\frac{a+b+c}{2}$

Here, s=13 a=8 and b=7​ substitute in the formula,

$13=\frac{8+7+c}{2}$

$13\times 2=15+c$

$26=15+c$

$c=26-15$

$c=11$

Therefore, the value of c is 11.

#Learn more

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