A polygon is just a word used to describe any plane figure bounded by straight lines. A triangle is just one of many different polygons; others are a rectangle, pentagon, octagon etc.
Triangles are said to be similar when they have the same shape but one is an enlargement of the other. The triangles must therefore be equi-angular and the ratios of corresponding sides have to be equal.
No. You can have two triangles that are congruent to one another, and two quadrilaterals that are congruent to one another. But the triangle cannot be similar to the quadrilateral!
Yes.
They are all polygons
They are all polygons.
All three are polygons.
Not normally but they are both polygons
they are all polygons
No. You can have two triangles that are congruent to one another, and two quadrilaterals that are congruent to one another. But the triangle cannot be similar to the quadrilateral!
Yes.
They are all polygons
They are all polygons.
Similar polygons are polygons for which all corresponding angles are congruent and all corresponding sides are proportional. From this definition we can say they have the same shape.
there all polygons and have angles
All three are polygons.
All of them.
-- All regular (equilateral) triangles are similar. -- All squares are similar. -- All pentagons are similar. -- All hexagons are similar. . . . etc. Any regular polygon is similar to all other regular polygons with the same number of sides.
A triangle, a square, a rectangle, a pentagon are all polygons.