📐

Geometry

Explore points, lines, angles, triangles, circles, area, volume, and geometric proofs.

7 Categories

22 Topics

Points, Lines, and Angles

Angle Relationships

Complementary, supplementary, and vertical angles

Parallel Lines and Transversals

Angle relationships formed by parallel lines

Triangles

Triangle Angle Sum Theorem

The sum of angles in a triangle

Congruent Triangles

SSS, SAS, ASA, AAS, and HL theorems

Pythagorean Theorem

Relationships in right triangles

Similar Triangles

AA, SAS, and SSS similarity theorems

Special Right Triangles

45-45-90 and 30-60-90 triangles

Triangle Inequalities

Apply triangle inequality theorem

Special Segments in Triangles

Medians, altitudes, and angle bisectors

Quadrilaterals and Polygons

Properties of Quadrilaterals

Parallelograms, rectangles, rhombi, squares, and trapezoids

Polygon Angle Sums

Interior and exterior angle formulas

Circles

Circle Basics

Parts of a circle and basic properties

Inscribed Angles

Angles with vertices on the circle

Inscribed Angles

Work with angles inscribed in circles

Sector Area and Arc Length

Finding areas and lengths of circle sectors

Tangent Lines

Properties of tangent lines to circles

Area and Perimeter

Area of Triangles and Quadrilaterals

Formulas for calculating area

Coordinate Geometry

Distance and Midpoint Formulas

Working with coordinates in the plane

Equations of Circles

Write and graph equations of circles

Slope and Equations of Lines

Finding and using slope in geometry

Solid Geometry

Volume of Solids

Finding volumes of prisms, pyramids, cylinders, cones, and spheres

Surface Area

Finding surface areas of 3D shapes