They are triangles with 3 equal sides and 3 equal interior angles or triangles that are congruent in shape
If the shape has 3 angles in all, where two of the angles are acute, then the shape is a scalene triangle.
a triangle
A seven sided shape is a heptagon.
No polygon can have less than 3 angles. It would be a triangle with 3 sides but that has 3 angles.
Triangle
An isoceles triangle.
Triangle
a triangle
triangle
a pentagon
3