Geometry math skills
37 skills, each with a short lesson, practice that adapts, and help when an answer is wrong.
Start freeA Congruence
A.1Transformations as functions
A.2Symmetry of polygons
A.3Sequences of transformations
A.4Corresponding parts of congruent triangles
A.5Triangle congruence criteria
A.6Vertical angles & linear pairs
A.7Parallel lines with algebra
A.8Reasons in geometry proofs
A.9Triangle angle sum & exterior angles
A.10Isosceles triangles
A.11Triangle midsegments
A.12Polygon angle sums
A.13Parallelogram properties
B Similarity, Right Triangles & Trigonometry
B.1Dilations: center & scale factor
B.2Similarity criteria (AA, SAS, SSS)
B.3Triangle proportionality
B.4Solve with similar triangles
B.5Trigonometric ratios
B.6Find a side with trigonometry
B.7Find an angle with inverse trigonometry
B.8Special right triangles
C Circles
C.1Inscribed & central angles
C.2Tangent lines
C.3Inscribed quadrilaterals
C.4Arc length
C.5Area of a sector
D Expressing Geometric Properties with Equations
D.1Equation of a circle
D.2Circles: complete the square
D.3Classify quadrilaterals with coordinates
D.4Parallel & perpendicular slopes
D.5Equations of parallel & perpendicular lines
D.6Midpoints & partitioning a segment
D.7Perimeter & area with coordinates
E Geometric Measurement & Dimension
E.1Volume of cylinders, cones & spheres
E.2Volume of pyramids
F Modeling with Geometry
F.1Model objects with shapes
F.2Density