Fill in the Blanks 7.9B Radius and Diameter practiceOnline version a combination on questions and problems regarding radius and diameters plus additional circle questions. by Ms. Lugo 1 24cm 12cm 6cm 3cm 7.5cm 321cm 7cm 24cm 264cm 21cm 123cm 1 . The radius of Circle A is 6cm , so the diameter is . 2 . The radius of Circle B is 3 . 5cm , so the diameter is . 3 . The radius of Circle C is , so the diameter is 48cm . 4 . The radius of Circle A is , so the diameter is 246cm . 2 triple apple pie a decimal perimeter double area half pi 1 . = 3 . 14 2 . circumference is just the of a circle . 3 . the radius is the diameter . 3 40 25 26 5 27 50 6 24 4 80 84 1 . If the diameter is 12 . 5 meters , the radius is . meters . 2 . If the diameter is 54 meters , the radius is meters . 3 . If the diameter is meters , the radius is 42 meters . If the diameter is meters , the radius is 2 . 5 meters .