A quadrilateral covers exactly half of the area of a rectangle. Find the length x in terms of a, b and c.
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Solution
The length x=bc/a.

Visual solution

Poem
When the sky is ringing
And cold air is passing by
When the rain is singing
When the wind is blowing
It’s sure
A tornado is coming
The clouds look terrifying
Speedy flashes of fire are lightning
Suddenly
A funnel form is turning
We can see a black and tall tornado swirling
