How to Measure a Circle *Radius Diameter & Circumference* 1. Radius: A line segment that goes from the center point to a point on the circle. Thus, it goes halfway through the circle. 2. Diameter: A line segment that goes all the way across a circle through the center point. 3. Circumference: The distance around the outside of the circle. #numbers #educationalvideosforkids #math Finding radius, diameter, and circumference: The diameter is always twice as long as the radius ; d = 2 x r. Important formulas: C = 2x Pi xr , C = Pi xd , d = C ÷ Pi Pi(Pi) is a special number that occurs in circles. Its decimal places keep going and going, but we can use the approximation 3.14. So, in calculations, think Pi ? 3.14. SUBSCRIBE https://tinyurl.com/yckbu4r5 WATCH MORE https://tinyurl.com/3ksmu7d9 FREE EDUCATIONAL GAMES FOR KIDS! https://www.brainstar.com/ Turtle Diary (Brain Star) creates educational videos for children about math, science, reading, writing, social studies and more! We believe learning can be fun for kids and have made it our passion to design educational interactive games and Youtube videos to help kids get excited about learning, in and out of the classroom. School isn\'t the only place to learn and grow. From ABCs and 123s to the science of motion, Turtle Diary (Brain Star) has kids education covered! Show Less >>