The circumference of a circle 20cm. What is the radius of the circle? Geometry Perimeter, Area, and Volume Circumference and Area of Circles 1 Answer Lithia · Shwetank Mauria Feb 17, 2017 #r=10/pi# #cm.# Explanation: Circumference of a circle is #C=2pir#, if #C=20# then #20=2pir# #10=pir# #r=10/pi# #cm.# Answer link Related questions What is the circumference of a 15-inch circle if the diameter of a circle is directly... If the radius of a circle is 4cm, what is the area? How do you find the circumference of a circle with a diameter of 6 cm? How much will it cost to paint a circular sign with a radius of 4 feet if the painter charges... What is the circumference of a circle with a radius of 30 inches? Write the equation of a circle with a center at (-3,-4) and a radius of 3? What is the perimeter of a quadrant of a circle with radius 3cm? I am installing a 1 yard-wide walk around circular swimming pool that is 21 ft in diameter. What... What is the circumference of a circle with radius of 30 inches? What is the equation of a circle with a center at (-3, -4) and a radius of 3? See all questions in Circumference and Area of Circles Impact of this question 34622 views around the world You can reuse this answer Creative Commons License