An orange square and a blue rectangle with two congruent inscribed circles. What is the angle α?

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## Solution

The angle α is 30°.

## Poem

The percentage

A pure number

A safe number

A safe value

Denominator

And fraction

For increases

Or discounts

An exercise

Of additions

And subtractions

Geometric progressions

For volumetric

quantities

And what happens in love ?

Which is the unit of measurement?

100 percent

## One reply on “A nice percentage”

Since I learned this, it has been useful:

For a right triangle with sides a b and c,

Where c is the long side,

The diameter d of the inscribed circle satisfies d = a + b – c