Geometry · lesson 5

Rotations Around the Origin

A quarter turn around the origin. Each point sweeps an arc and lands on its new coordinates, one at a time.

90°counterclockwise:(x, y) → (−y, x)Swap the two numbers, then make the new first one negative.
Step 1

Here is triangle ABC

Three points. We are going to spin the whole triangle a quarter turn.

  1. The work will print here, one line at a time.
Projecting? Press Space for the next step.
Try another
original triangle ABC after the turn, A′B′C′ the pin — the origin

oomath.com · Mr. Mohammed · all lessons