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High school geometry


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Course content

282 Lessons

Geometry foundations

Intro to Euclidean geometry
Euclid as the father of geometry
Terms & labels in geometry
Lines, line segments, & rays
Specifying planes in three dimensions
Geometric definitions example
Measuring angles in degrees
Measuring angles using a protractor
Measuring angles using a protractor 2
Acute, right, & obtuse angles
Vertical angles
Equation practice with vertical angles
Complementary & supplementary angles
Equation practice with complementary angles
Equation practice with supplementary angles
Angles, parallel lines, & transversals
Parallel & perpendicular lines
Missing angles with a transversal
Measures of angles formed by a transversal
Proving angles are congruent
Angles in a triangle sum to 180° proof
Triangle exterior angle example
Worked example: Triangle angles (intersecting lines)
Worked example: Triangle angles (diagram)
Triangle angle challenge problem 2
Sum of interior angles of a polygon
Sum of the exterior angles of a polygon
Triangle inequality theorem
Intro to quadrilateral
Quadrilateral properties
Kites as a geometric shape
Quadrilateral types
Proof: Opposite sides of a parallelogram
Proof: Opposite angles of a parallelogram
Perimeter & area
Area of a triangle
Area of a parallelogram
Area of trapezoids
Area of kites
Area of a triangle on a grid
Area of a quadrilateral on a grid
Area of composite shapes
Perimeter & area of composite shapes
Challenge problems: perimeter & area
Radius, diameter, circumference & π
Area of a circle
Radius & diameter from circumference
Area of a circle intuition
Intro to nets of polyhedra
Surface area using a net: rectangular prism




Right triangles & trigonometry

Solid geometry

Analytic geometry


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62 Courses