Geometry

Adjacent angles are angles that have a common vertex and a common side but do not overlap. Recall that a ... Read more

Thales’ theorem tells us that a triangle inscribed in a circle, where the hypotenuse corresponds to the diameter of the ... Read more

Thales’ theorem tells us that the diameter of a circle always forms a right triangle when we connect it to ... Read more

The 3D Pythagorean theorem is an extension of the 2D Pythagorean theorem that can be used to solve problems in ... Read more

A triangle is a three-sided polygon that has three vertices and three interior angles. The sum of the interior angles ... Read more

Stellations are formed when we extend the sides of a polygon and those sides intersect each other. The number of ... Read more

The missing square puzzle is an optical illusion found in mathematics that is used to teach reasoning using the axioms ... Read more

Special triangles are right triangles that have special proportions for their sides. The 30°-60°-90° triangle has the proportions 1:√3:2. The ... Read more

Similar triangles are characterized by having corresponding sides with the same proportions, but not necessarily with the same measurements. On ... Read more

The triangular inequality is one of the most commonly known theorems in geometry. This theorem tells us that the sum ... Read more