Two Dendritic Julia Sets “Mating” To Cover The Sphere.

😭😭😭

Plate 17. Guide to the construction of Gothic details. 1888.

Internet Archive

Cool !

Calculating the surface area of a sphere. Found on Imgur.

Created by Dave Richeson.

Sum of Triangular Numbers.

Shearer’s geometry puzzles

On his blog MathWithBadDrawings, Ben Orlin reposted a couple of geometrical sangaku-like puzzles by math teacher Catriona Shearer. These are eleven of her personal favorites. If you dare, definitely give them a try!

Transit Across a Purple Sun. What’s the total shaded area?

Shearer’s Emerald. Four squares. What’s the shaded area?

The Pyramid with Two Tombs. Two squares inside an equilateral triangle. What’s the angle?

Setting Sun, Rising Moon. What fraction of the rectangle is shaded?

Hex Hex Six. Both hexagons are regular. How long is the pink line?

Four, Three, Two. What’s the area of this triangle?

The Trinity Quartet. All four triangles are equilateral. What fraction of the rectangle do they cover?

The Falling Domino. This design is made of three 2×1 rectangles. What fraction of it is shaded?

Slices in a Sector. The three colored sections here have the same area. What’s the total area of the square?

Disorientation. The right-angled triangle covers ¼ of the square. What fraction does the isosceles triangle cover?

Sunny Smile Up. What fraction of the circle is shaded?

Piada bilíngue:

Sabe por que a formiga tem 4 patas? Porque se ela tivesse 5 seria uma Fivemiga... 🤣😋😂😆😎😉

Realmente os matemáticos são muito otimista com relação ao conhecimento, mas isso pode ser frustante para muitos estudantes, pois sem persistência não há como continuar nesse meio!

math problem: *begins with “we know that..”*

me: WE dont know SHIT