Make: Volume 77

PROJECTS: Remaking History

This geometric truth means you can multiply,

divide, find ratios, scale up, scale down, and

so on, just by building or measuring similar

triangles. And that’s how the sector works; it’s

basically just a quick and easy way to build and

scale similar triangles.

Making a sector is an easy and inexpensive

project and something that parents and children

can make together and have fun using even

without a specific goal in mind. But don’t let its

relative simplicity fool you; the sector is useful to

woodworkers, artists, metal workers, and others

in a bunch of different ways.

So, let’s get started. First, we’ll fabricate ...