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
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!
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