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http://www.mathsisfun.com/definitions/radius.html, http://www.mathsisfun.com/geometry/circle.html, https://www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-circumference-circle/v/area-of-a-circle, http://www.virtualnerd.com/pre-algebra/perimeter-area-volume/circles/circle-sector-area-examples/sector-area-formula, consider supporting our work with a contribution to wikiHow. r&=\sqrt{\frac{12.56}{3.14}}\\ To find the radius from the diameter, you only have to divide by two: If you know the circumference it is a bit harder, but not too bad: Area, on the other hand, is all the space contained inside the circle. &=58\:\text{cm} r&=2 \:\text{cm} Study.com has thousands of articles about every The coordinates of the center are \( (h,k) \). [2] X Research source The symbol π{\displaystyle \pi } ("pi") is a special number, roughly equal to 3.14. That gives you the circumference of the circle. \therefore r&=5 We use cookies to make wikiHow great. Use the calculator above to calculate the properties of a circle. {{courseNav.course.topics.length}} chapters | STEP 2 : circumference = 2 x pi x r = (2)(pi)( 5.5) = 11 x pi = 34.54 &= 2\pi r \\ | {{course.flashcardSetCount}} 1. &= 2\times \pi \times 5 \\ For example, you might have a circle with a diameter of 4 centimeters.

To find the radius from the diameter, you only have to divide by two: r=d/2. Enrolling in a course lets you earn progress by passing quizzes and exams. \[\begin{align} You can't do it without additional information. She has a PhD in Chemistry and is an author of peer reviewed publications in chemistry. A radius is a straight line from the center of a circle to the circumference of a circle. \therefore 12.56&=(\pi \times r^2)\\ Sometimes the word 'radius' is used to refer to the line itself. Visit the High School Geometry: Tutoring Solution page to learn more. If the diameter of the circle is known, we can calculate the radius using the formula: \[\text{Radius}= \frac{\text{Diameter}}{2}\]. Last Updated: May 18, 2020 Already registered? Attempt the test now. You can test out of the IMO (International Maths Olympiad) is a competitive exam in Mathematics conducted annually for school students. Refer to the formulas below to calculate the radius. Who Are the One Percent in the United States by Income and Net Worth. The circumference of a circle in terms of its radius is expressed as: Area of a Circle is the area occupied by the circle. When the center of the circle is at origin \((0,0)\), the equation of the circle reduces to: Arc of the circle is the distance between two points along a section of a curve. You can observe this change by dragging the blue endpoint outwards on the circle. The radius of the curve is the radius of the circle of which it is a part.

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