Shrink Ray Lab

Shrink Ray Lab is a multiplayer math review game for Geometry. Claim squares by dilating points, using dilation properties, proving triangles similar and solving side-splitter, angle-bisector and right-triangle problems. Get 4 in a row to win.

Skills: Dilating points about the origin and about any center, finding a scale factor, how dilations affect lines, angles, lengths and areas, enlargements vs. reductions, AA, SSS and SAS similarity, corresponding parts from a similarity statement, the triangle proportionality (side-splitter) theorem, midsegments, the angle bisector theorem, altitude to the hypotenuse and geometric means.

New problems every game, with Easy, Medium and Hard levels. Every miss shows a short explanation.

Standards (Oklahoma OAS first, then national):

OAS G.2D.1.8, 10–11

Common Core: HSG-SRT.A.1, 3 · HSG-SRT.B.4

What you get: one HTML game file that runs in any browser (Chromebooks, laptops, iPads, smartboards) plus a one-page Quick Start PDF. 1–6 players or teams, no logins, no installs.

Single-teacher license. Included in the Fletcher Math All-Access bundle.