The Osborne 1 is the first commercially successful portable microcomputer, released on April 3, 1981 by Osborne Computer Corporation. It weighs 10.7 kg (24.5 lb), cost US$1,795, and runs the CP/M 2.2 operating system
The circumference of a circle can be found using the formula , where is the circle's circumference and is the circle's radius. We know that and that we are solving for . Therefore:
