### Equiangular Polygons

Illustration of a two polygons. Polygons may be mutually equiangular without being mutually equilateral.

### Equilateral Polygons

Illustration of two polygons. Polygons may be mutually equilateral without being mutually equiangular…

### 2 Concentric Septagons/Heptagons

Illustration of 2 regular concentric heptagons/septagons.

### 2 Concentric Septagons/Heptagons

Illustration of 2 regular concentric heptagons/septagons.

### 3 Concentric Septagons/Heptagons

Illustration of 3 regular concentric heptagons/septagons that are equally spaced.

### 4 Concentric Septagons/Heptagons

Illustration of 4 regular concentric heptagons/septagons that are equally spaced.

### Equal Spheres With Triangles

Illustration of equal spheres with equilateral and equiangular triangles.

### Square Inscribed In A Square

Illustration of a square inscribed in a square. The interior square is rotated 45° in relation to…

### 12 Congruent Rotated Squares

Illustration of 12 congruent squares that have the same center. Each square has been rotated 7.5°…

### 16 Congruent Rotated Squares

Illustration of 16 congruent squares that have the same center. Each square has been rotated 5.625°…

### 2 Concentric Squares

Illustration of 2 concentric squares whose vertices are connected by line segments.

### 2 Concentric Squares

Illustration of 2 concentric squares.

### 2 Concentric Squares

Illustration of 2 concentric squares.

### 2 Congruent Rotated Squares

Illustration of 2 congruent squares that have the same center. One square has been rotated 45° in…

### 3 Concentric Squares

Illustration of 3 concentric squares that are equally spaced.

### 3 Congruent Rotated Squares

Illustration of 3 congruent squares that have the same center. Each square has been rotated 30°…

### 4 Concentric Squares

Illustration of 4 concentric squares that are equally spaced.

### 4 Congruent Rotated Squares

Illustration of 4 congruent squares that have the same center. Each square has been rotated 22.5°…

### 6 Congruent Rotated Squares

Illustration of 6 congruent squares that have the same center. Each square has been rotated 15°…

### 8 Congruent Rotated Squares

Illustration of 8 congruent squares that have the same center. Each square has been rotated 11.25°…

### Squares Inscribed In Squares

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

### Squares Inscribed In Squares

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

### Squares Inscribed In Squares

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

### Equilateral triangle

"Having equal sides." — Williams, 1889

### Equilateral Triangle

Sketch of equilateral triangle with bisectors, medians, and altitudes.

### Equilateral Triangle

Illustration showing an equilateral triangle (one that has three sides equal).

### Nonagon Inscribed in a Triangle

Illustration of a regular nonagon inscribed in an equilateral triangle. This could also be described…

### Equilateral And Isosceles Triangles

An illustration showing an isosceles triangle in an equilateral triangle.

### Equilateral Triangle Inscribed In An Equilateral Triangle

Illustration of an equilateral triangle inscribed in an equilateral triangle. The smaller triangle is…

### Equilateral Triangles Inscribed In An Equilateral Triangle

Illustration of an equilateral triangle inscribed in an equilateral triangle by joining the midpoints…

### Equilateral Triangles Inscribed In Equilateral Triangles

Illustration of an equilateral triangle inscribed in an equilateral triangle by joining the midpoints…

### Equilateral Triangles Inscribed In Equilateral Triangles

Illustration of an equilateral triangle inscribed in an equilateral triangle by joining the midpoints…