Unsupported browser

You are using an outdated browser. Please upgrade your browser to improve your experience.

Sign up for an Award

Participate with your entry in one of our professional or student awards.

Sign up for an award

Sign up for a Profile

Create your own profile and publish it in the iF WORLD DESIGN GUIDE.

Sign up for a profile

Learn more:


Present your project for free and win your share of EUR 50,000 in prize money.

Publish your project

Circling / Compasses


We always need to make sure the radius of the circle on the ruler when we use the compass. It is not only troublesome and inefficient, but also inaccurate. This conception is based on the characteristics of isosceles triangle---the length of the median of two equal sides is half equal to the base’s. With the combination of compass and tape measure, you can assure the accuracy of radius quickly. When using it, you only need to the pull compasses, find the corresponding length, double it, and then you can get the radius of the circle (which can be corrected to millimeter), which will greatly facilitate the compasses operation.


Jiangnan University

Jiangnan University
wuxi, China


Nanjing Mei Yi Zhi Jia eco-tech co.

Nanjing Mei Yi Zhi Jia eco-tech co.
Nanjing, China