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  2. List of triangle inequalities - Wikipedia

    en.wikipedia.org/wiki/List_of_triangle_inequalities

    That is, in triangles ABC and DEF with sides a, b, c, and d, e, f respectively (with a opposite A etc.), if a = d and b = e and angle C > angle F, then >. The converse also holds: if c > f, then C > F. The angles in any two triangles ABC and DEF are related in terms of the cotangent function according to [6]

  3. Triangle inequality - Wikipedia

    en.wikipedia.org/wiki/Triangle_inequality

    The second part of this theorem is already established above for any side of any triangle. The first part is established using the lower figure. In the figure, consider the right triangle ADC. An isosceles triangle ABC is constructed with equal sides AB = AC. From the triangle postulate, the angles in the right triangle ADC satisfy:

  4. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    The Kepler triangle is a right triangle whose sides are in geometric progression. If the sides are formed from the geometric progression a, ar, ar 2 then its common ratio r is given by r = √ φ where φ is the golden ratio. Its sides are therefore in the ratio 1 : √ φ : φ. Thus, the shape of the Kepler triangle is uniquely determined (up ...

  5. Right triangle - Wikipedia

    en.wikipedia.org/wiki/Right_triangle

    A right triangle ABC with its right angle at C, hypotenuse c, and legs a and b,. A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle (1 ⁄ 4 turn or 90 degrees).

  6. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

  7. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    Every acute triangle has three inscribed squares (squares in its interior such that all four of a square's vertices lie on a side of the triangle, so two of them lie on the same side and hence one side of the square coincides with part of a side of the triangle). In a right triangle two of the squares coincide and have a vertex at the triangle ...

  8. Triangle’s ‘Missing Middle’ housing: Where did it go? What ...

    www.aol.com/triangle-missing-middle-housing...

    The result is a growing housing affordability crisis, squeezing the so-called “missing middle” — people earning 80% to 120% of the median income. They’re a typical family, likely a two ...

  9. File:Isosceles-right-triangle.svg - Wikipedia

    en.wikipedia.org/wiki/File:Isosceles-right...

    This work has been released into the public domain by its author, Dante.This applies worldwide. In some countries this may not be legally possible; if so: Dante grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.