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Geometry Lessons


Geometry is a branch of mathematics that deals with shapes, sizes and configurations of 2-dimensional shapes and 3-dimensional figures. Listed below are videos of geometry lessons to help kids learn about geometry, 2D & 3D shapes, polygons, calculation of areas, volumes etc.
Watch videos  Watch Videos & Lessons:  (Reviewed by K-12 teachers)

Rectangular Coordinate System
Grade: 4 - 12
The math lesson explains how to use a number line in a rectangular coordinate system. It explains horizontal and vertical axis lines, quadrants, coordinates, ordered pairs, and integers.

Point, Line, Plane, and Space - Geometry Lesson
Grade: 4 - 12
The lesson explains the definitions of a point, a line, a plane, and space, as well as the symbols that are used in geometry to represent each figure. Also learn the definitions of collinear, coplanar, and intersection.

Polygons - Geometry Lesson
Grade: 4 - 12
The lesson explains the types and definitions of a polygon, concave and convex polygons.

Types of Polygons - Geometry Lesson
Grade: 4 - 12
In this math lesson, learn about the polygon classifications based on number of sides - triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon and dodecagon.

Introduction to Angles, part 1
Grade: 4 - 12
Learn what an angle is. Angles in a circle. Complementary and supplementary angles.

Introduction to Angles, part 2
Grade: 4 - 12
Learn about complementary and supplementary angles. Lesson introduces opposite angles.

Introduction to Angles, part 3
Grade: 4 - 12
The lesson explains that angles are formed when a transversal intersects parallel lines.

45-45-90 Triangles
Grade: 4 - 12
Introduction to 45-45-90 Triangles.

Intro to 30-60-90 Triangles
Grade: 4 - 12
A few more examples of 45-45-90 triangles followed by an introduction to 30-60-90 triangles.

Tangents and Circles - Geometry Lesson
Grade: 4 - 12
Math lesson on tangents and circles. Learn about the theorems related to tangents, and use these theorems to find missing segment and angles. Also learn about common internal tangents and common external tangents.

Radius, Chord, Diameter, and Secant
Grade: 4 - 12
Math lesson on radius, chord, diameter, and secant of a circle. Learn the definitions of a circle, a radius, a chord, a diameter, a secant, a tangent, congruent circles, concentric circles, an inscribed circle, and a circumscribed circle. Learn to identify or draw these figures in given problems.

Introduction to the Pythagorean Theorem
Grade: 6 - 12
Math lesson on right angle triangles and the Pythagorean Theorem.

Area of a Triangle - Geometry Lesson
Grade: 6 - 12
In this lesson, learn the formula for the area of a triangle, and solve problems using this formula. Note that the lesson uses right triangle formulas and trigonometry extensively.

Area of a Rectangle - Geometry Lesson
Grade: 6 - 12
Math lesson on area of a rectangle. Learn the concepts of area and perimeter, as well as the formulas for the area and perimeter of a rectangle and a square. Solve problems using these formulas.

Area of a Parallelogram - Geometry Lesson
Grade: 6 - 12
In this lesson, learn the formula for the area of a parallelogram, and solve problems using this formula. Right triangle formulas and trigonometry are used extensively in the problems in this lesson.

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