# orderedItems[].content
In August of Japan, the method of cutting pizza and cake into equal areas as shown in the figure was popular on Twitter! It can be found at the following URLs:
https://twitter.com/mathlava/status/11 63796284760662017
https://twitter.com/5Hanayome/status/1 164875472917811201
(I was most inspired by https://twitter.com/potetoichiro .)
cf. https://zh.wikipedia.org/wiki/%E6%8A%A B%E8%96%A9%E5%AE%9A%E7%90%86#N=4%E7%9A%84%E6%83%85%E5%86%B5
and https://arxiv.org/abs/1512.03794

# orderedItems[].contentMap.en
In August of Japan, the method of cutting pizza and cake into equal areas as shown in the figure was popular on Twitter! It can be found at the following URLs:
https://twitter.com/mathlava/status/11 63796284760662017
https://twitter.com/5Hanayome/status/1 164875472917811201
(I was most inspired by https://twitter.com/potetoichiro .)
cf. https://zh.wikipedia.org/wiki/%E6%8A%A B%E8%96%A9%E5%AE%9A%E7%90%86#N=4%E7%9A%84%E6%83%85%E5%86%B5
and https://arxiv.org/abs/1512.03794

# orderedItems[].summary
Recently I was taught the following two expressions formula,

# orderedItems[].content
From https://youtu.be/dO40DZk-qNU , I found https://www. wolframalpha.com/input/?i=(1%2 Fx-5%2F(x%2Ba)%2B10%2F(x%2B2a)-10%2F(x%2B3a)%2B5%2F(x%2B4a)-1%2F(x%2B5a))*x*(x%2Ba)*(x%2B2a)*(x%2B3a)*(x%2B4a)*(x%2B5a)%3D(5!)+*+a%5E5 , Still I can't prove this proof yet.
It does not matter at all,
#ENWP "Tangential quadrilateral" https://en.wikipedia.org/wiki/Tangenti al_quadrilateral has an inscribed circle if only three sides (The fourth side must be \(a+b-c\) .) are decided (The shape is completely determined by the determination of another angle).
Thanks from https://twitter.com/takatasennsei !

# orderedItems[].contentMap.en
From https://youtu.be/dO40DZk-qNU , I found https://www. wolframalpha.com/input/?i=(1%2 Fx-5%2F(x%2Ba)%2B10%2F(x%2B2a)-10%2F(x%2B3a)%2B5%2F(x%2B4a)-1%2F(x%2B5a))*x*(x%2Ba)*(x%2B2a)*(x%2B3a)*(x%2B4a)*(x%2B5a)%3D(5!)+*+a%5E5 , Still I can't prove this proof yet.
It does not matter at all,
#ENWP "Tangential quadrilateral" https://en.wikipedia.org/wiki/Tangenti al_quadrilateral has an inscribed circle if only three sides (The fourth side must be \(a+b-c\) .) are decided (The shape is completely determined by the determination of another angle).
Thanks from https://twitter.com/takatasennsei !

# orderedItems[].content
Now I make PDF https://shinshu.us/itou.pdf , Thanks! We will plan to generalize Twitter "じゃがりきんａｐｕ長ピーポ黄金角形" https://twitter.com/wasanp_/status/109 7612948007088128 in the future. #予定未定

# orderedItems[].contentMap.en
Now I make PDF https://shinshu.us/itou.pdf , Thanks! We will plan to generalize Twitter "じゃがりきんａｐｕ長ピーポ黄金角形" https://twitter.com/wasanp_/status/109 7612948007088128 in the future. #予定未定

# orderedItems[].content
@jsiehler I'm playing your #SlidingBlockPuzzles with so exciting! http://homepages.gac.edu/~jsiehler/ga mes/Blocks-App/index.html (If I understand mechanism that one piece moving one time anyway is counted as 1-move, I may be able to reduce MOVES more!)

# orderedItems[].contentMap.ja
@jsiehler I'm playing your #SlidingBlockPuzzles with so exciting! http://homepages.gac.edu/~jsiehler/ga mes/Blocks-App/index.html (If I understand mechanism that one piece moving one time anyway is counted as 1-move, I may be able to reduce MOVES more!)

# orderedItems[].summary
Now, I am interested in the following three.

# orderedItems[].content
1: "Sums of three cubes" https://en.wikipedia.org/wiki/Sums_of_ three_cubes has generalized parametric representation "A New Method in the Problem of Three Cubes" https://arxiv.org/abs/1802.06776 (cf. ex. Old article in Japanese http://www. asahi-net.or.jp/~KC2H-MSM/math land/math04/math0403.htm ).
2: DANIEL SCHER "A DOUBLE SPIRAL FROM DAVID HENDERSON" http://www. sineofthetimes.org/a-double-sp iral-from-david-henderson/
3: Paul Bourke "Danzer Aperiodic Tiling" http://paulbourke.net/geometry/tiling plane/ telling by GirihApp@Twitter https://twitter.com/GirihApp/status/11 06615831742558208 . I do similar one of the attached image

# orderedItems[].contentMap.ja
1: "Sums of three cubes" https://en.wikipedia.org/wiki/Sums_of_ three_cubes has generalized parametric representation "A New Method in the Problem of Three Cubes" https://arxiv.org/abs/1802.06776 (cf. ex. Old article in Japanese http://www. asahi-net.or.jp/~KC2H-MSM/math land/math04/math0403.htm ).
2: DANIEL SCHER "A DOUBLE SPIRAL FROM DAVID HENDERSON" http://www. sineofthetimes.org/a-double-sp iral-from-david-henderson/
3: Paul Bourke "Danzer Aperiodic Tiling" http://paulbourke.net/geometry/tiling plane/ telling by GirihApp@Twitter https://twitter.com/GirihApp/status/11 06615831742558208 . I do similar one of the attached image