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Free, modern prep for the China Scholastic Competency Assessment. Interactive lessons · 300+ practice questions · timed mock exams.

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Mathematics

High freq

Solid Geometry & Space Coordinates

Geometry in 3D space — distances, volumes, diagonals. Example: distance from (0,0,0) to (3,4,12) is 13.

5 lessons · 20 slides

0 → hero
1

The 3D Coordinate System

Add a z-axis to the 2D plane — every point has 3 coordinates

2 slides

2

The 3D Distance Formula

Pythagorean theorem applied twice — just add the z-term

3 slides

3

Cube & Sphere Shortcuts

Memorize these — they save 30 seconds per question

3 slides

4

Don't Drop the z-term

The trap of mixing 2D and 3D formulas

1 slides

5

Practice: 3D Geometry (CSCA-style)

Distances, diagonals, volumes — single-number CSCA drills

11 slides