The japanese progression

An isosceles trapezium with its inscribed circle. If the lengths are such that b-a=c-b=d-c, what is a : b : c : d?

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a : b : c : d is 4 : 5 : 6 : 7.

Solution by Lewis Corner.


The japanese progression
This is the rising sun
From the great divinity
The celestial sun goddess
The majestic beauty
That brings good luck
It has it’s roots in mythology
And you can find me
On the flag in Yamanashi
For I am a strong symbol
For japanese victory


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