triangle angles - Geometr

Proofs

Why the Angles of a Triangle Sum to 180°: A Simple Proof

triangle angle sum proof

Consider how extending sides creates supplementary angles that reveal why triangle angles always add up to 180°.

Geometr Team
December 9, 2025

3d line and plane equations

Coordinate Geometry

3D Coordinate Geometry: Equations of Lines and Planes

Just exploring the equations of lines and planes in 3D coordinate geometry unlocks…

Geometr Team
December 11, 2025

solving geometric equations analytically

Coordinate Geometry

Analytic Geometry: Solving Problems With Equations

Keen to unlock the secrets of shapes and lines through equations? Continue reading to…

Geometr Team
December 10, 2025

shading regions on graph

Coordinate Geometry

Graphing Inequalities: Shading Regions on the Plane

Prepare to master graphing inequalities and shading solution regions; understanding…

Geometr Team
December 10, 2025