Circle
A circle is the set of all points equidistant from a center point. One of the most fundamental shapes in geometry.
S = πr²
C = 2πr
Read full article →
Formulas & Theorems
Shapes
Triangle
A three-sided polygon, the simplest closed shape. Triangles are the building blocks of all polygons.
S = ½ · a · h
P = a + b + c
Read full article →
Square
A regular quadrilateral with four equal sides and four right angles. Perfect symmetry in its simplest form.
S = a²
P = 4a
Read full article →
Rectangle
A quadrilateral with four right angles. Opposite sides are equal and parallel.
S = a · b
P = 2(a + b)
Read full article →
Hexagon
A six-sided polygon. Regular hexagon appears naturally in honeycombs and snowflakes.
S = (3√3/2) · a²
P = 6a
Read full article →
Parallelogram
A quadrilateral with two pairs of parallel sides. Opposite sides and angles are equal.
S = a · h
P = 2(a + b)
Read full article →
Cube
A three-dimensional solid with six equal square faces. The simplest regular polyhedron.
V = a³
A = 6a²
Read full article →
Sphere
A perfectly round three-dimensional object. Every point on its surface is equidistant from the center.
V = ⁴⁄₃πr³
A = 4πr²
Read full article →
Geometry
About
A website dedicated to geometry formulas. Accurate calculations and clear explanations for all basic geometric shapes — from circles to spheres.
Shapes