8
4
No, a regular isosceles triangle will not tessellate. In order for a shape to tessellate, it must be able to fit together with copies of itself without any gaps or overlaps. Regular isosceles triangles have angles of 90, 45, and 45 degrees, which do not allow for a repeating pattern that covers a plane without any spaces. Regular polygons that tessellate include equilateral triangles, squares, and hexagons.
The regular tetrahedron - one of the 5 platonic solids.
True.
A regular octagon has 8 sides.
No. It is the opposite sides of a regular octagon that are parallel and congruent.
No, a regular octagon has 8 congruent sides
rectangle
8 if it's a regular octagon
Eight triangles of equal size form a regular octagon.
Yes, it can, even a regular octagon.
An octagon can have congruent angles if it is regular, meaning all its sides and angles are equal. In a regular octagon, all eight internal angles are congruent, each measuring 135 degrees. However, an irregular octagon may have varying angles, so the number of congruent angles can differ. In summary, a regular octagon has eight congruent angles, while an irregular one may have fewer or none.
four
if it has all congruent sides, then it is regular
Regular polygons have congruent angles such as squares and equilateral triangles.
It is a regular octagon.
Yes:As the shape is regular all sides are equal in length (and congruent).An octagon has 8 sides. As this is an even number of sides, the opposite sides are parallel.