When solving problems working backwards it is helpful if students follow a plan. The students must also recognize the relationships of radius, diameter, circumference and/or area within the formula. In order to work backward to solve circle measurement problems, students must have a good understanding of the formulas for finding circumference and area of a circle. Today students will use a four step problem-solving plan to implement the strategy of working backwards, starting with values they know to solve for the values they do not know. ** When only the radius is known, you need to multiply it by 2 (2r = d) to find the diameter.įor an funny (but informative) song to help to remember circumference, π and diameter check out this link to teachertube that changes the lyrics of the Tommy Twotone song 86953o9 to 3.14159 The formula for calculating the exact length of the circumference of a circle is C = πd, where C stands for circumference, π is the symbol for 3.14 and d stands for diameter. The formula for estimating the approximate length of the circumference of a circle is C = 3d where C stands for circumference, and d stands for diameter In math check out the following weblink: Today students will learn the exact formula for calculating the distance around a circle (circumference) using the constant Piįor more information on the history and uses of π Often measuring the circumference is impractical or a more exact formula than "about 3 times" is needed. When finding the approximate answer to a question we use the symbol (≈) to indicate that the answer is close to but not exactly the correct answer. Yesterday we learned that the circumference of a circle is approximately three times its diameter.
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