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enter image description here

Based on the image above we have: 

u1 = area(b, a2) / area(a1, a2)
u2 = area(b, a1) / area(a1, a2)

The books says: "An easy way to see how these ratios of areas correspond to u1 and u2 is to shear the parallelograms formed by b, a2 and b, a1 onto the a1 and a2 axes, respectively.".

I've ended up with:

enter image description here

My question

Did I draw it properly, does the ratios based on my drawings make sense?

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