#Geometry Problem 604: #Parallelograms #Triangle #Trapezoid #Area https://t.co/BcrYlRyeUX #math #highschool pic.twitter.com/k4s4kDFaAr

— Antonio Gutierrez (@gogeometry) March 3, 2018

[math]\frac{-b\pm\sqrt{b^2-4ac}}{2a}[/math][br][br]With math type

#Geometry Problem 604: #Parallelograms #Triangle #Trapezoid #Area https://t.co/BcrYlRyeUX #math #highschool pic.twitter.com/k4s4kDFaAr

— Antonio Gutierrez (@gogeometry) March 3, 2018

How does this prove the yellow and grey areas have equal areas?

If the yellow area are 3 and 7, what is the value of the gray area?