Three choices, depending on what information you have about the circle:
-- Multiply the radius by itself, then multiply the result by (3.1416).
-- Multiply the diameter by itself, then multiply the result by (0.7854).
-- Multiply the circumference by itself, then multiply the result by (.07958).
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A quadrilateral has four sides. A circle does not have four sides. Therefore, a circle is not a quadrilateral.
How do you find the area of an unequal quadrangle?
To find the area of 11 and 18 you multiply it.
Area of what? Every geometrical shape has a different formula to find its area. The simplest one: to find the area of a rectangle whose edge lengths are h and w, area = h*w.
The measurements that you need to find the area of a square is Area = Length x Width.