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## Homework Statement

attached. It is just part a i am attempting for now.

## Homework Equations

area of trapezoid = h(b1+b2 / 2)

where h is height, b1 is base one and b2 is base two.

## The Attempt at a Solution

i really tried, i didn't know where to start. the answer i got was 30cm for base, while the correct answer was 20cm for base and sides. I am not sure where to go with this problem my first try was a guess and obviously didn't work properly. I think maybe i need someone to better explain this problem to me.