Circles and all regular polygons.
A regular polygon is always equiangular.
Sometimes. Remember, in order for two polygons to be similar, their angles must be congruent, and their corresponding sides must be proportional. In a rhombus, it is always possible for the angles to differ.
Regular polygons. A square and rectangle will have congruent (equal length) diagonals.
A square, pentagon, decagon, octagon are always regular polygons.
Equiangular (not eqiangular) polygons are equiangular. These can be, but need not be, regular polygons.
no. similar polygons do not have the same area. similar just means that they have the same angle measurements and are proportional.
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All polygons can be irregular sense the requirements for a polygon to be irregular is for 1 or more sides to be unequal to the others. So a pentagon is sometimes a regular polygon. Hope that answers your question.
never ever ever
similar polygons may not be congruent (different sizes) congruent polygons are always similar (equal in every geometric respect - including
No, regular polygons are always convex and are shapes constructed using straight lines. concave polygons are irregular.
Not all polygons are regular by definition. An irregular polygon may have non-congruent sides or non congruent angles or both. A regular polygon will always have both congruent sides and angles.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.
Regular polygons are always convex by definition.
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A polygon is a closed figure with 3 or more sides/angles, and the lines must always be straight. A circle isn't a polygon. Quadrilaterals are always polygons but polygons are not always quadrilaterals. So the answer is "sometimes."
Congruent figures are always similar. However, similar figures are only sometimes congruent.
They add to 360 degrees.