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# Course Updates for Basic Geometry in July 2021

Updated

We are excited to share that we've made significant enhancements to our Basic Geometry course. One consequence of adding this new content is that it may impact learners’ Mastery percentages.

When we add new content and remove old content, Mastery percentages often change because the number of available skills changes. For example, if you mastered 90 out of 100 skills in a course, and we added 10 new skills, your mastery skill count would then be 90 out of 110. This change would change your Mastery percentage from 90% to 82%.

With this specific course update, we expect that Mastery percentages will change by a maximum of 30%. Most people will see a much smaller Mastery percentage change.

You can see exactly what content items we’ve added and removed below. Happy learning!

Articles

Exercises

Videos

### Content Removed

Articles

 Graphing coordinates review Parallel and perpendicular lines review Quadrilateral problems on the coordinate plane Translations intro Vertical angles review Volume formulas review

Exercises

 Analyze shapes Analyze shapes by angles Area of rectangles with partial arrays Area of right triangles Area of trapezoids Benchmark angles Classify shapes Classify triangles by side lengths Compare shapes Complementary and supplementary angles (no visual) Constructing triangles Determine rotations Dilate points Dilations and properties Dilations: center Draw parallel and perpendicular lines Equal parts of circles Equal parts of rectangles Find missing length when given area of a parallelogram Find missing length when given area of a triangle Find perimeter when a side length is missing Find surface area by adding areas of faces Identify geometric solids (3D shapes) Identify parts of 3D shapes Identify quadrilaterals Identify shapes Name shapes 3 Ordering triangle sides and angles Partitioning rectangles Quadrants on the coordinate plane Quadrilateral problems on the coordinate plane Reflect points Reflecting points in the coordinate plane Rotate points Translate points Types of angles by measure Use area of squares to visualize Pythagorean theorem Volume with cubes with fraction lengths

Videos

 Another Pythagorean theorem proof Area of kites Area of trapezoids Bhaskara's proof of the Pythagorean theorem Coordinates of a missing vertex Coordinates of rectangle example Counting faces and edges of 3D shapes Cousin Fal's shape collection Dilations and properties Dilations: center Dimensions of a rectangle from coordinates Drawing parallel line segments Equal parts of circles and rectangles Example of shapes on a coordinate plane Finding circumference of a circle when given the area Finding distance with Pythagorean theorem Garfield's proof of the Pythagorean theorem Intro to quadrilateral Ordering triangle sides and angles example Partitioning rectangles Points and quadrants example Pythagorean theorem proof using similarity Quadrants of the coordinate plane Recognizing common 3D shapes Recognizing shapes Reflecting points in the coordinate plane Shapes and angles Translating points Volume with fractional cubes