Three triangles have the same base. What is the top angle γ of the middle one in terms of the other ones α and β?
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The angle γ=(α+β)/2.
A jewel so precious
A symbolic object
Showing the power
Of the monarchy
Crowns are for kings and queens probably
But there is a also crown in a simple tree
Building the forest and plants canopy
Crowns so green with a big density
And perhaps a crown for the Xmas tree