# Geometry foundations

## Intro to Euclidean geometry

Learn
Euclid as the father of geometryTerms & labels in geometryLines, line segments, & raysSpecifying planes in three dimensionsGeometric definitions example
Practice
Identify rays, lines, & line segmentsGet 5 of 7 questions to level up!
Draw rays, lines, & line segmentsGet 5 of 7 questions to level up!
Points, lines, and planesGet 5 of 7 questions to level up!
Geometric definitionsGet 5 of 7 questions to level up!

## Angles

Learn
Measuring angles in degreesMeasuring angles using a protractorMeasuring angles using a protractor 2Acute, right, & obtuse anglesVertical anglesEquation practice with vertical anglesComplementary & supplementary anglesEquation practice with complementary anglesEquation practice with supplementary anglesAngles, parallel lines, & transversalsParallel & perpendicular linesMissing angles with a transversalMeasures of angles formed by a transversalProving angles are congruent
Practice
Measure anglesGet 3 of 4 questions to level up!
Angle typesGet 3 of 4 questions to level up!
Vertical anglesGet 3 of 4 questions to level up!
Equation practice with vertical anglesGet 3 of 4 questions to level up!
Complementary and supplementary angles (visual)Get 3 of 4 questions to level up!
Equation practice with angle additionGet 3 of 4 questions to level up!
Angle relationships with parallel linesGet 5 of 7 questions to level up!
Equation practice with anglesGet 3 of 4 questions to level up!

## Polygons

Learn
Angles in a triangle sum to 180° proofTriangle exterior angle exampleWorked example: Triangle angles (intersecting lines)Worked example: Triangle angles (diagram) Triangle angle challenge problem 2Triangle angles reviewSum of interior angles of a polygonSum of the exterior angles of a polygonTriangle inequality theoremIntro to quadrilateralQuadrilateral propertiesKites as a geometric shapeQuadrilateral typesProof: Opposite sides of a parallelogramProof: Opposite angles of a parallelogram
Practice
Finding angle measures between intersecting linesGet 3 of 4 questions to level up!
Finding angle measures using trianglesGet 5 of 7 questions to level up!
Angles of a polygonGet 3 of 4 questions to level up!
Triangle side length rules Get 3 of 4 questions to level up!
Quadrilateral typesGet 3 of 4 questions to level up!
Quadrilateral anglesGet 5 of 7 questions to level up!

## Area

Learn
Perimeter & areaArea of a triangleArea of trianglesArea of a parallelogramArea of trapezoidsArea of kitesArea of a triangle on a gridArea of a quadrilateral on a gridArea of composite shapesPerimeter & area of composite shapesChallenge problems: perimeter & areaRadius, diameter, circumference & πArea of a circleRadius & diameter from circumferenceArea of a circle intuitionIntro to nets of polyhedraSurface area using a net: rectangular prism
Practice
Area of trianglesGet 5 of 7 questions to level up!
Area of parallelogramsGet 3 of 4 questions to level up!
Area of trapezoidsGet 3 of 4 questions to level up!
Areas of shapes on gridsGet 3 of 4 questions to level up!
Area of composite shapesGet 3 of 4 questions to level up!
Radius and diameterGet 5 of 7 questions to level up!
Area of a circleGet 5 of 7 questions to level up!
Shaded areasGet 3 of 4 questions to level up!
Circumference of a circleGet 3 of 4 questions to level up!
Nets of polyhedraGet 3 of 4 questions to level up!
Surface area using netsGet 3 of 4 questions to level up!
Surface areaGet 3 of 4 questions to level up!