Math Spiral 19: Math Practice Standard 3

Constructing viable arguments and critiquing the reasoning of others is a vital math skill to master. In the geometry section, Sarah argues that the only way to find the area of the quadrilaterals is to know the exact formula to calculate the area of a quadrilateral. Do you agree with her mathematical claim? Make sure to provide sufficient reasoning in your response and show your work if you feel it will increase the reader's understanding.