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Geometry Help
Looking for some Geometry Help? Our materials here review the basic terms and concepts in geometry and provide further lessons to help you develop your understanding of geometry and its applications to solving problems in real life.
Geometry is about the shape and size of things. It is the study of points, lines, angles, shapes, their relationships, and their properties.
Geometry Practice Questions
Free SAT Practice Questions (with Hints & Solutions) -
Geometry:
Questions 1-5,
Questions 6-10
Geometry Word Problems
Geometry Topics
Introduction
Basic
Geometry Terms
Points,
Lines, Line Segments,
Midpoints, Rays, Planes,
Space
Pairs
of Lines
Intersecting
Lines, Parallel Lines, Perpendicular
Lines, Skew Lines
Angles
Angles
Naming an
Angle (includes video), Measuring an Angle, Angles Around a Point
Types
of Angles
Right Angles (includes video), Acute
Angles, Obtuse
Angles, Straight
Angles
Pairs
of Angles
Complementary Angles, (includes video)
Supplementary Angles, (includes video)
Vertical Angles, (includes video)
Corresponding Angles, (includes video)
Alternate Interior Angles,
Alternate
Exterior Angles
"Find the angle" problems (includes video)
Triangles
Types
of Triangles
Right Triangles,
Acute Triangles,
ObtuseTtriangles,
Equilateral
Triangles,
Isosceles Triangles,
Scalene Triangles
Special
Right Triangles
3-4-5 Triangles, (includes video)
45°-45°-90° Triangles, (includes video)
30°-60°-90° Triangles (includes video)
Pythagorean
Theorem
(includes video)
Congruent
Triangles
SSS rule, SAS
rule, ASA rule,
AAS rule
Similar
Triangles
(includes video)
AA rule, RAR rule
Triangle Inequality
Triangle Inequality Theorem,
Angle-Side Relationship
Angles of a Triangle
Polygons
Quadrilaterals
(includes video)
Parallelograms, Rhombus,
Rectangles, Squares, Trapezoids
Types of Polygons
(includes video)
Angles in Polygons (includes video)
Sum
of Angles in a Triangle, Dividing
Polygons into Triangles,
Formula for Sum
of Interior and Exterior Angles
Areas of Polygons
Squares,
Rectangles, (includes video)
Parallelograms, (includes video)
Triangle, (includes video)
Rhombus, (includes video)
Trapezoids (includes video)
Perimeters of Polygons
Squares,
Rectangles, Parallelograms,
Triangle, Rhombus,
Trapezoids
Circles
Circles
Diameter,
Radius, Arc,
Tangent,
Circumference, (includes video)
Area
(includes video)
Circle Theorems
Chords of a Circle
Angles in a Circle
Quadrilaterals in a Circle
Solid Geometry
Volume of Solids
Cubes,
Rectangular Solids,
Prisms, Cylinders,
Spheres, Cones,
Pyramids, Nets of Solids
Surface Area of Solids (includes video)
Coordinate Geometry
Coordinate
Geometry
Coordinate Plane, (includes video)
Slopes, y-intercept,
Negative Slope, (includes video)
Equation of a Line,
(includes video)
Graphing Linear Equations (includes video)
Slope and Intercept of a Linear Equation (includes video)
Equation of a Line Parallel to the X-axis or Y-axis (includes video)
Equation of a Line Given Its Slope and a Point on the Line (includes video)
Equation of a Line Given Two Points on the Line (includes video)
Slopes of Parallel Lines,
Slopes of Perpendicular Lines, (includes video)
Midpoint Formula (includes video)
Distance Formula
(includes video)
Geometric Construction
Geometric Construction
Construct a Perpendicular Bisector (includes video)
Construct a 60° Angle by Constructing An Equilateral Triangle (includes video)
Construct An Angle Bisector (includes video)
Construct A Triangle Given The Length Of Its Three Sides
Construct A Triangle Given One Side And Two Angles
Construct A Triangle Given Two Sides And An Angle
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Useful Links:
Mensuration
More Geometry Help on MathWorld
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