This one page worksheet gives students focused, independent practice in determining radius and diameter. Circle graphics and measurements are combined and students are required to view the graphic and determine whether or not the radius or diameter is indicated. They then solve for the opposing measurement. A guide is given at the top of the worksheet the help remind students of the definitions of radius and diameter. Repeated practice helps students learn to discern the difference between the two measurements and develop an understanding of radius and diameter. Great for extra practice, re-teach, or standardized test extra practice.