Finding the Area of a Circle Finding the Area of a Circle The area of circle can be used by multiplying pi(? = 3.14) by the square of the radius. If a circle has a radius of 5, the area is 3.14*5*5*= 78.5 The diameter of the radius is ½ as large and Finding the Area of a Circle. Diameter of circle= 14, so, radius = 7 Area= (7²)= 49 * ? = 49? cm². The distance around a circle is called as circumference and the distance which across the circle through its center is called diameter. In the Greek letter ? (pronounced Pi) it represents the ratio of the circumference of a circle to the diameter. The formula for circumference of a circle is C= ?* d. we use ?= 3.14. The diameter of a circle is as long as the radius. This expressed in the following formula: D= 2*R. TO finding the area of circle is the number of square units inside the circle. If each and every square of the circle is left and it has a area of 1cm², and now we can count total number of
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the area of this circle. A= ?*r² or A= ?*r*r Where A= area , R= radius ?= 3.14 Area of the circle is discussed below in steps: Step1: The length of the radius (“ r square”). If you measure the diameter of the one side of the circle to the other and then it is divide by the radius. And the radius is ½ of the diameter. Step2: The formula for finding the area of the circle is: Area = pi multiply by ( r square) A= ? r² Step 3: Multiply the radius and square. Step 4: Multiply by pi. The area of the circle which present inside the circle's circumference. Example1: Area of a circle where radius= 1.87, area = ?(radius)², area= ?(1.87)²=3.4969.
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The radius of the circle is 9” , the area is ?(9”)² = 81 ? square inches 253square inches The area of the circle is 253 . And how to find the area of circles by using the formula: A= pr². Theory : The area of the circle of radius 'r' is given by: area = pr² Example1: if 'r' = 7 for a given circle, and p = 3.14, then the area of the circle is: area = pr², = 3.14 * 7², = 153.86 Also, the area of the circle is known, then the radius is: r = √area/ ? Example2: If the area of the circle is 120, and p= 3.14, then the radius of the circle is r= √area/ ?, = √120/3.14, = √3.488535, = 1.86776203 2. Another example is find the area of the circle whose radius is 10m using approximate value for ? of 22/7. Answer is : r= 10m A= ? r²,= 22/7* 10²,= 22/7* 100, = 314.28571 so, the area is 31428.571.
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