- #1

griffon

- 3

- 0

OK the area of a trapezoid is

A=2bh

I know that much, but I've been struggling with this one, off and on, for about two days. I just don't know where to start. I'm not looking for an answer, just a starting point please.

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- Thread starter griffon
- Start date

- #1

griffon

- 3

- 0

OK the area of a trapezoid is

A=2bh

I know that much, but I've been struggling with this one, off and on, for about two days. I just don't know where to start. I'm not looking for an answer, just a starting point please.

- #2

Fermat

Homework Helper

- 872

- 1

A = ½(b1 + b2)*h

where b1 and b2 are the lengths of the parallel sides and h is the perpindicular distance between them.

You want to maximise this area, so find a relation between h and (b1 and b2) using the angle the side plank is at.

Then A is a function of the angle. Maximise A wrt the angle.

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