quadrilatéral
121Sega Saturn — Sega Saturn …
122John Wesley — Infobox Person name = John Wesley image size = 175px caption = birth date = birth date|1703|6|29|mf=y birth place = Epworth, Lincolnshire, England death date = death date and age|1791|3|2|1703|6|28|mf=y death place = education = Charterhouse… …
123Parallelogram — In geometry, a parallelogram is a quadrilateral with two sets of parallel sides. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are congruent. The three dimensional counterpart of a… …
124Incircle and excircles of a triangle — A triangle (black) with incircle (blue), incentre (I), excircles (orange), excentres (JA,JB,JC), internal angle bisectors (red) and external angle bisectors (green) In geometry, the incircle or inscribed circle of a triangle is the largest circle …
125List of geometric shapes — This is a list of geometric shapes.Generally composed of straight line segments* polygon ** concave polygon ** constructible polygon ** convex polygon ** cyclic polygon ** decagon ** digon ** dodecagon ** nonagon ** equiangular polygon **… …
126Heron's formula — In geometry, Heron s (or Hero s) formula states that the area (A) of a triangle whose sides have lengths a , b , and c is :A = sqrt{sleft(s a ight)left(s b ight)left(s c ight)}where s is the semiperimeter of the triangle::s=frac{a+b+c}{2}.Heron s …
127Squaring the circle — Squaring the circle: the areas of this square and this circle are equal. In 1882, it was proven that this figure cannot be constructed in a finite number of steps with an idealized compass and straightedge …
128Hyperbolic geometry — Lines through a given point P and asymptotic to line R. A triangle immersed in a saddle shape plane (a hyperbolic paraboloid), as well as two diverging ultraparall …
