Since the radius is 5 cm, the diameter is 10 cm, and pi x 10 cm is the answer, or 31.4159 cm. 2.Trace both sides of ruler onto circle. Set ruler down across circle at any point. If a circle has a diameter of 4, its circumference is 3.14*4=12.56 A = Ïr 2 . Substituting r = 2 in the formula, we get, Circumference of a circle = inches. C = 2Ïr. 14 July - Learn how to calculate the circumference and area of a circle in terms of Ï, leaving your answer in exact form. Hence, the circumference of the circle is inches. The calculations are done "live": How to Calculate the Area. Find the radius or diameter of a circle when given the circumference. One is #22/7#, which is common in use and the other is â¦ Lay your ruler across the circle. Calculate the area, circumference, radius and diameter of circles. Area of a Circle Calculator. A simple method to find the center of a circle when all you have is a ruler is to: 1. The radius is 11cm find the exact circumference in cm and the area in sq cm. The circumference of a circle is the distance around the outside of the circle. Transforming the original equation we calculated that the diameter of the circle with circumference of 10 meters is 3.18 meters.Obviously knowing that we can easily find the radius of that circle as it is exactly a half of its diameter: 1.59 meters. It is also called as the longest chord of the circle. Enter the radius, diameter, circumference or area of a Circle to find the other three. The radius of the circle = 12 inches. 4.Use ruler to connect these two marks and extend to edges of circle. Area of a circle. How to find the circumference of a circle: The circumference of a circle can be found by multiplying pi ( Ï = 3.14 ) by the diameter of the circle. It could be called the perimeter of the circle. Answer: A circle with a circumference of 132 ft. has a radius of about 21 ft. #4 Find the Circumference of a Circle Given the Area. Scribe a â¦ The diameter of a circle is the straight line passing through the center of the circle. If you're seeing this message, it means we're having trouble loading external resources on our website. Find A, C, r and d of a circle. 5.Measure that lines center point and you have found your center! 3.Measure each of the two lines and mark their centers. Find the circumference of a circle when given either the radius or diameter. Circumference or perimeter of a circle is defined as the distance around it. Place one side on the edge, and rotate the ruler until you hit a nice round number on the other side. You can do this anywhere, other than the exact diameter of the circle. Since, the circumference of a circle = , where r= radius. The ratio between the circumference of a circle and its diameter is #pi#.We commonly write #c = 2pir#, using the radius instead and doubling it.. About 1500 years ago, a Chinese mathematician named Zu Chongzhi (ç¥æ²ä¹) calculated #pi# to approximately #7# decimal places and identified two useful rational approximations. Given any 1 known variable of a circle, calculate the other 3 unknowns. Pi times the diameter of a circle gives its circumference. Problem: Find the circumference of a circle that has an area of 78.5 m. squared. This online diameter to circumference converter helps you to find the perimeter value from the given diameter at desired units. ... Formulas you need: Circumference of a circle. Substitute r = 11 cm into your formulas and solve. Circle formulas and geometric shape of a circle. So, option C is correct. Solution: This is a two-step problem. Note in the photo that the ruler hits the edges at the exact 0" and 9" marks. 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