Respuesta :

Ans: Third option, b= 18x cm

Base = Area / Height = 81x^2 / 4.5x
= 18x cm

Finding a parallelogram’s area is essentially finding a rectangle’s area. See below:
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Answer:

18x cm

Step-by-step explanation:

A=BH

81x²cm²=B(4.5x cm)

81x²cm²÷(4.5x cm)= 18x cm