Shrink Ray Lab

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.

Geometry4-in-a-row1–6 players or teamsNo student loginsWorks offline

$5Buy Shrink Ray Lab ▶ Play the free demo 🎁 Get this game free

Try it free with your class: the demo runs right in your browser for 5 questions or 5 minutes, whichever comes first. No sign-up needed.

Or get every game, including all future games, with the All-Access Teacher License for $150.

Screenshot of Shrink Ray Lab in the middle of a game

What students practice

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

Standards

OAS G.2D.1.8, 10–11

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

How it works

Open the game file in any web browser: Chromebooks, laptops or your smartboard. No accounts, no student logins and no internet needed once it's downloaded.
Enter the players or teams, then press Start.
Students take turns on one shared screen, so the whole class can play together on a projector or smartboard.
Each purchase includes the game file and a one-page Quick Start guide.