A Pentagon.
A pentagon
A pentagon
a pentagon
hexagon
This will be a regular pentagon.
An equilateral pentagon.
No congruent sides is a scalene, two congruent sides is an isosceles triangle, three is an equilateral.
These triangles are impossible:-- a triangle with more or fewer than three sides-- a triangle with more or fewer than three angles-- a triangle with three interior angles that add up to less than 180 degrees-- a triangle with three interior angles that add up to more than 180 degrees-- a triangle with a side that's longer than the sum of the lengths of the other two sides-- a triangle with one 90-degree angle in it, where the square of the length of the longest sideis not the same as the sum of the squares of the lengths of the other two sides
-- Each number has to be (more than the difference of the other two) but (less than their sum). -- Count the lengths of the sides. If you get to three and then run out of numbers, it's a triangle.
Yes, two sides of the triangle have to add up to more than the third side
A polygon may have many more than four sides, a triangle has only three vertices.
Using the traditional definitions, a triangle that has two equal sides (and angles) is an isosceles triangle and one with three equal sides (and angles) is an equilateral triangle. However, some mathematicians define an isosceles triangle as any triangle having at least two equal sides, which is what you are describing.