The diameter of a circle is the straight line passing through the center of the 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. Area of a Circle Calculator. You can do this anywhere, other than the exact diameter of the circle. The radius is 11cm find the exact circumference in cm and the area in sq cm. 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. Note in the photo that the ruler hits the edges at the exact 0" and 9" marks. Area of a circle. Place one side on the edge, and rotate the ruler until you hit a nice round number on the other side. Given any 1 known variable of a circle, calculate the other 3 unknowns. If you're seeing this message, it means we're having trouble loading external resources on our website. Solution: This is a two-step problem. So, option C is correct. Enter the radius, diameter, circumference or area of a Circle to find the other three. Lay your ruler across the circle. The calculations are done "live": How to Calculate the Area. 5.Measure that lines center point and you have found your center! Problem: Find the circumference of a circle that has an area of 78.5 m. squared. Find the radius or diameter of a circle when given the circumference. A = Ïr 2 . 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¥æ²ä¹) calculated #pi# to approximately #7# decimal places and identified two useful rational approximations. Substituting r = 2 in the formula, we get, Circumference of a circle = inches. Find A, C, r and d of a circle. Hence, the circumference of the circle is inches. 4.Use ruler to connect these two marks and extend to edges of circle. The circumference of a circle is the distance around the outside of the circle. Substitute r = 11 cm into your formulas and solve. Pi times the diameter of a circle gives its circumference. Since the radius is 5 cm, the diameter is 10 cm, and pi x 10 cm is the answer, or 31.4159 cm. A simple method to find the center of a circle when all you have is a ruler is to: 1. 14 July - Learn how to calculate the circumference and area of a circle in terms of Ï, leaving your answer in exact form. Since, the circumference of a circle = , where r= radius. Circumference or perimeter of a circle is defined as the distance around it. This online diameter to circumference converter helps you to find the perimeter value from the given diameter at desired units. 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. If a circle has a diameter of 4, its circumference is 3.14*4=12.56 Calculate the area, circumference, radius and diameter of circles. C = 2Ïr. Set ruler down across circle at any point. One is #22/7#, which is common in use and the other is â¦ The radius of the circle = 12 inches. 2.Trace both sides of ruler onto circle. Scribe a â¦ Circle formulas and geometric shape of a circle. It could be called the perimeter of the circle. 3.Measure each of the two lines and mark their centers. Find the circumference of a circle when given either the radius or diameter. It is also called as the longest chord of the circle. ... Formulas you need: Circumference of a circle. 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