Geometry

Geometry is the course where students learn to prove things. It opens with proof itself, with postulates, definitions, theorems, and the properties of congruence, and students keep writing proofs in every unit that follows. Along the way: transformations and rigid motions, the triangle congruence criteria, similarity by AA, SSS, and SAS, and a long unit on circles that takes in the inscribed angle theorem, Thales' theorem, tangent and secant relationships, and radian measure. The second half moves geometry onto the coordinate plane, works through triangles, quadrilaterals, and right-triangle trigonometry, then finishes with solid geometry and a unit on probability and combinatorics.

Six units, about 179 topics. Because proof is a habit rather than a chapter, earlier theorems keep reappearing inside later proofs, and review of a topic is scheduled for the point at which a student would otherwise start forgetting it. Learning to build an argument that holds up under scrutiny is worth as much outside of mathematics as in it.

In the traditional sequence, Geometry sits between Algebra 1 and Algebra 2. Schools on the integrated path spread most of this material through Integrated Math II, alongside quadratics and probability. Either way, the diagnostic at the start of the course establishes what a student already has. How we teach math.

What your enrollment includes

One enrollment covers the whole course and earns 1.0 credit. There is no Part A and Part B, and no separate Semester 1 or Semester 2 purchase — you buy the course once.

• 10 months of Math Academy. Full access to the adaptive platform that runs the course, for ten months from the day the student starts.
• Daily one-on-one tutoring. With an AHS Online math teacher, every school day from 11:00 AM to 1:00 PM.
• Math Hub. Live, teacher-led group sessions on Mondays and Thursdays — see the live class schedule.

How Math Hub works

Math Hub is where a student gives an account of their work: what they have been working on, where they are stuck, and what they need help with. A student who is pacing well and performing well does not need to attend. A student who has fallen off pace will be expected to attend until they are back on track. And any student is welcome at any time, simply because they want to do more mathematics and learn more about it.