Topics · 3 courses · 6 lessons
Geometry
Angles, parallel lines, triangles and quadrilaterals — with reasons.
Why this order
Parallel-line rules come first because they prove the angle sum of a triangle, which in turn gives the angle sum of a quadrilateral.
Step 1 · MA4-ANG-C-01
Parallel lines
Corresponding and alternate angles are equal; co-interior angles add to 180°.
2 lessons · 0/5
Step 2 · MA4-ANG-C-01
Unknown angles
Find the angle and — just as important — name the reason.
2 lessons · 0/5
Step 3 · MA4-GEO-C-01
Triangles & quadrilaterals
Angle sums, isosceles base angles, and the properties of the special quadrilaterals.
2 lessons · 0/5
Test the whole strand
A mixed mock from every geometry course, marked at the end.