You'll like draw a perfect square or rectangle by drawing congruent angles to form the box, and then congruent triangles (equilateral ... (not just a pair). The symbol that represents ...

Now we have an equilateral triangle. Three sides of equal length ... You know that one of the angles is 90°, represented by the right angle symbol, and another is 35°. And you also know that ...

A pretty theorem in the latter is that all equilateral triangles in a given plane project ... A rather irritating feature is that the symbol ∞ is used for two entirely different purposes ...

Now we have an equilateral triangle. Three sides of equal length ... You know that one of the angles is 90°, represented by the right angle symbol, and another is 35°. And you also know that ...