Free geometry lessons
Prerequisites
- Basic geometry
- Types of angles
- Complementary and supplementary angles
- Types of polygons
- Convex polygons
- Concave polygons
- Sum of all exterior angles of a polygon
- Types of triangles
- Types of quadrilaterals
- Relationships among special quadrilaterals
- Solid figures
- Properties of parallelograms
- Isometric drawing
- Tangent circles
- Concentric circles
- Inscribed and circumscribed circles
Perimeter and Area of Shapes
- Perimeter of shapes
- Perimeter of a square
- Perimeter of a rectangle
- Perimeter of a triangle
- Perimeter of a trapezoid
- Perimeter of a circle
- Perimeter formulas
- Perimeter word problems
- Area of shapes
- Area of triangles
- Area of an equilateral triangle
- Area of a kite
- Area of a trapezoid
- Area of irregular shapes
- Area of a circle
- Area of a sector
- Area of a regular polygon
- Heron's formula
- Heron's formula calculator
The circle
- Introduction to the circle
- How to find the number pi
- Circumference of a circle
- Area of a circle
- How to approximate the area of a circle
Volume and Surface Area of Shapes
- Volume of solids
- Volume of a cube
- Volume of a box
- Volume of a sphere
- Volume of an ellipsoid
- Volume of a cylinder
- Volume of a cone
- Volume of a pyramid
- Volume of irregular shapes
- Difference between volume and capacity
- Volume formulas
- Finding surface area
- Surface area of a cube
- Surface area of a rectangular prism
- Surface area of a cylinder
- Surface area of a square pyramid
- Surface area of a sphere
- Surface area of a cone
- Surface area formulas
Congruence and Similarity
Transformations
Slope and standard form of a line
- What is slope
- How to find the slope
- Undefined slope
- Graphing slope
- Slope intercept form
- Point slope form
- Slope calculator
Pythagorean theorem
- Pythagorean theorem
- Converse of the Pythagorean theorem
- Pythagorean triples
- Special right triangles
- Pythagorean word problems
- Pythagorean theorem calculator
Geometric formulas
Construction in geometry- Straightedge and compass construction
- Tessellations in geometry
- Line symmetry
- Order of rotational symmetry
Geometric calculator
Word problems in geometry
Math problem solving strategies
Common mistakes in math
Interesting topics
Direct variation
Goal:
- Identify basic shapes in geometry
- Find perimeter and area of shapes
- Find volume and surface area of solids
- Learn about congruency
- Find and graph the slope
- Find the standard from of a line
- Solve word problems in geometry
- Explore some important proofs in geometry
- And more!
Recent Articles
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Modeling Multiplication
Nov 15, 18 05:01 PM
Modeling multiplication with number counters - Learning multiplication is fun!
New math lessons
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Recent Articles
-
Modeling Multiplication
Nov 15, 18 05:01 PM
Modeling multiplication with number counters - Learning multiplication is fun!
-
Properties of Congruence
Nov 09, 18 09:40 AM
Learn the three properties of congruence. Examples to illustrate which property.
-
Compound Interest Word Problems and Solutions
Nov 07, 18 02:38 PM
Practice with these well chosen compound interest word problems
-
Compound Interest Formula- Explained
Nov 06, 18 02:37 PM
What is the compound interest formula? Which one is the principal?
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How to Write an Inequality
Oct 29, 18 02:26 PM
Learn how to write an inequality quickly with this easy to follow math lesson.
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Optical Illusions with Geometry
Oct 22, 18 04:14 PM
Take a good look at these optical illusions with geometry
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Why the Rule of 72 Works
Oct 15, 18 11:05 AM
why the rule of 72 works- math explanation of where the 72 came from.
Recent Lessons
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Modeling Multiplication
Nov 15, 18 05:01 PM
Modeling multiplication with number counters - Learning multiplication is fun!
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