Question

find the triangle of c if in a triangal s=13 ,a=8,b=7​

Answer 1

Answer:

13=8+7+c

13-15=c

-2=c

Answer 2

Answer:

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$s = 13 \: \: \: \: a = 8 \: \: \: b = 7$

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

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

$= > \frac{15 + c}{2} = 13$

$= > 15 + c = 13 \times 2$

$= > 15 + c = 26$

$= > c = 26 - 15$

$= > c = 11$