Yes
yes
Equilateral triangle, square and regular hexagon.
Equilateral triangle, square and regular hexagon.
No, never in plane geometry.
If it's interior angle is a factor of 360 then it will tessellate such as a square, a regular hexagon and an equilateral triangle.
No. An equilateral polygon with 5 or with 7 or more sides will not tessellate a plane.
the sum of the angles of a plane triangle is always 180° In an equilateral triangle, each of the angles is = Therefore, the angles of an equilateral triangle are 60°
No because a regular polygon will only tessellate if its interior angle is a factor of 360 degrees. For example an equilateral triangle will tessellate because its interior angle is 60 degrees which is a factor of 360 degrees.
No. Equilateral heptagons (7 sided figures) do not tessellate the plane. Not if no other polygons are allowed. But if you allow a (non-equilateral) pentagon then you might be able to tessellate the plane!
a plane triangle is a normal triangle, like the isosceles, right angled, equilateral and scalene triangle.
No.
No