Hence radius r = 3.7 cm (rounded to one decimal place) In other words replace “C” by as shown below: Now replace “C” by the formula to find the circumference using radius. In such situation the formula to find the circumference and the reverse engineering is used to find the radius.įor example let’s find the radius of a circle whose circumference is given to be 21 meters.įirst of all let’s write the given circumference of the circle using math representation, as shown below The second type of problems asking to find the radius of a circle, when its circumference is given. Finding radius of a circle when the circumference of this circle is given. Hence, the method to find the radius of a circle from its diameter and then use radius to find the area and circumference of the circle.Ģ. Similarly we can find the area of the circle using the following formula Now formula for the circumference of the circle is as given below: Need not to worry, we are given with the diameter and divide it by 2 to get radius as shown below: To solve above problem we’ll use the radius in the circle formulas. As said earlier, the radius is half the diameter so divide the diameter by 2 to get the radius of the circle.įor example find the circumference and area of a circle with diameter of 12 cm. There is an easy step to convert the diameter into radius. In such situations, students have to find the radius of the circle from its diameter. Instead they prefer to use the formulas with radius. Many students don’t like to use the diameter in the formulas of circumference and area of the circle. Many circle geometry problems involve finding circumference and area of a circle when the diameter of the circle is given in the question. Finding the radius when the diameter is known or given.
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