The perimeter of a quadrilateral (four sided plane shape) is 125 cm . If the three known sides measure a=12 cm, b=45 cm, and c=30.5 cm, how long is the fourth side?

Correct answer:

d =  37.5 cm

Step-by-step explanation:

o=125 cm a=12 cm b=45 cm c=30.5 cm  a+b+c+d=o  d=oabc=125124530.5=37.5 cm

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