Equilateral triangle.
Also a square.
Also a regular pentagon.
Also any regular polygon of any number of sides.
A shape with equal sides and angles is a called a regularshape.
[But there are also other shapes, such as a rhombus, which has equal sides but is not a regular polygon because it does not have equal angles. There is no collective name for such "squashed" polygons".]
Any regular shapes have equal sides, including squares and equilateral triangles. Irregular shapes can also have equal sides, but not equal angles.
The only shape that always has equal sides and equal angles is the square.Other shapes can have equal sides and angles (like a triangle or octagon), but they are not by definition equilateral.--------I think it is worth noting that any regular polygon satisfies the definition. Conversely, as you point out, you have to explicitly specify that it is regular.
It all depends on the shape; different 2D geometrical shapes have different characteristics.Some specialized geometrical shapes:Square: 4 sides; 4 equal sides; 2 pairs of parallel sides; 4 right angles (90 degrees)* A square is a rectangle.Rectangle: 4 sides; 2 pairs of parallel sides; 4 right angles (90 degrees)* A rectangle is not a square.Triangle (equilateral): 3 sides; 3 equal sides; all angles 60 degreesTriangle (isosceles): 3 sides; 2 equal sides (usually the base is the odd one)Triangle (scalene): 3 sides; all uneven sides and anglesRhombus: 4 sides; 4 equal sides; 2 pairs of parallel sides; 4 equal anglesParallelogram: 4 sides; 1 pair of parallel sidesThese are the basic geometrical 2D shapes, but there are others that are more complex.
The base angles of an isosceles triangle that has two equal sides are equal.
A square has 4 equal sides with opposite angles that are equal.
The only similarities between these shapes are that:These shapes have all congruent interior anglesObviously, the shapes are regular and have equal sides.
Shapes with equal adjacent sides include squares and rhombuses. In a square, all four sides are equal, and all angles are right angles. A rhombus also has all sides equal, but its angles are not necessarily right angles. Additionally, certain parallelograms can have equal adjacent sides if they are specifically constructed to do so.
Squares
Any regular shapes have equal sides, including squares and equilateral triangles. Irregular shapes can also have equal sides, but not equal angles.
The two shapes that are both parallelograms are rectangles and rhombuses. A rectangle has opposite sides equal and all angles equal to 90 degrees, while a rhombus has all sides equal in length with opposite angles equal. Both shapes maintain the properties of parallelograms, such as opposite sides being parallel and equal in length.
A regular polygon has all sides equal length, and all of the angles are equal.
Regular shapes are shapes where all the sides and angles are equal. One example of a regular shape is a square because all the sides are the same and all the angles are 90 degrees.
Squares
An equilateral triangle.
They can have some (or all) equal angles. A rectangle, for example, has all four angles equal but, because its sides are not the same measure, it is not a regular shape.
Some common plane shapes include triangles, squares, rectangles, and circles. A triangle has three sides and three angles, with the sum of the angles always equal to 180 degrees. A square has four equal sides and four right angles, while a rectangle also has four right angles but opposite sides are equal. A circle is defined by its radius and has no sides or angles, with all points equidistant from the center.
A shape with four equal straight sides is a square. In addition to having equal sides, a square also has four right angles. Another example of a shape with four equal sides is a rhombus, although its angles are not necessarily right angles. Both shapes are classified as quadrilaterals.