Respuesta :

calculista
we know that

the Law of Cosines established:
AC² = AB² + BC² - 2·AB·BC·cos(b)       
Therefore
AC = √(90² + 80² - 2·90·80·cos(50)     
=√5243.86     
= 72.4 in

Now you can sum up all the sides in order to find the perimeter:
AB + BC + AC = 90 + 80 + 72.4 = 242.4 in

the answer is
242.4 in

Answer:

A. 242.4

Step-by-step explanation:

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