Isosceles and Equilateral

In geometry, an equilateral triangle is a triangle in which all three sides are equal. In traditional or Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. They are regular polygons, and can therefore also be referred to as regular triangles. Read more on – Wikipedia
In Euclidean geometry, an isosceles trapezoid (isosceles trapezium in British English, also known as a symtra) is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides, making it automatically a trapezoid. Some sources would qualify all this with the exception: “excluding rectangles.” Two opposite sides (bases) are parallel, the two other sides (legs) are of equal length. The diagonals are of equal length. An isosceles trapezoid’s base angles are equal in measure. Read more on – Wikipedia

Video on Isosceles and Equilateral

Credit Khan Academy

Leave a Reply