how sides does a circle have?
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A circle is an infinitely long line. There are only two sides of any line. Therefore the Circle has only TWO sides. Philosophically, the two sides represent what is contained within the circle (One Side) and what is contained outside the circle (Second Side).
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We know that the general equation for a circle is ( x - h )^2 + ( y - k )^2 = r^2, where ( h, k ) is the center and r is the radius. So add 21 to both sides to get the constant term to the righthand side of the equation. Then complete the square for the y terms.
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A corner is where 2 sides meet. E.g. a triangle has 3 straight sides and 3 corners, whereas a circle has 1 curved side but no corners.
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Find formulas for the circle's radius, diameter, circumference and area , in terms of 'a'. As we've shown above, the circle's radius is equal to the half the length of the square's side, so r=a/2. The diameter is twice the radius, so d=a. The circumference is d ·π, so C=πa.
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Multiply the length of one side of a regular polygon by the number of sides to find its perimeter. Regular polygons have identically sized sides. For example, if the shape is a regular pentagon, which has 5 sides, with a side length of 4 inches, then multiplying 4 inches by 5 results in a perimeter of 20 inches.
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A regular polygon has equal length sides with equal angles between each side. Any other polygon is an irregular polygon, which by definition has unequal length sides and unequal angles between sides. Circles and shapes that include curves are not polygons - a polygon, by definition, is made up of straight lines.
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The formula to find a circle's area π (radius)2 usually expressed as π⋅r2 where r is the radius of a circle. The area of a circle is all the space inside a circle's circumference. In diagram 1, the area of the circle is indicated by the blue color. The area is not actually part of the circle.
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Square! The sides of a square are all congruent (the same length.) The angles of a square are all congruent (the same size and measure.) Remember that a 90 degree angle is called a "right angle." So, a square has four right angles.
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Opposite sides of a rectangle are the same length (congruent). The angles of a rectangle are all congruent (the same size and measure.) Remember that a 90 degree angle is called a "right angle." So, a rectangle has four right angles. Opposite angles of a rectangle are congruent.
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When a circle is inscribed in a square, the length of each side of the square is equal to the diameter of the circle. That is, the diameter of the inscribed circle is 8 units and therefore the radius is 4 units. The area of a circle of radius r units is A=πr2 .
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Explanation: The area of a circle is πr2 where r is the radius. Dividing both sides by π we find r2=16=42 and hence r=4 .
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Regular tessellation We have already seen that the regular pentagon does not tessellate. A regular polygon with more than six sides has a corner angle larger than 120° (which is 360°/3) and smaller than 180° (which is 360°/2) so it cannot evenly divide 360°.
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When working with a circle, any line through the center of the circle is a line of symmetry. There are an infinite number of lines of symmetry. Basically, a figure has point symmetry when it looks the same when up-side-down, (rotated 180º), as it does right-side-up.
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Because a circle is a flat, plane shape, it is a face. But because it is round around the outside, it does not form any edges or vertices. A cylinder has two circular faces but also no edges or vertices. A pyramid has one base and at least three triangular faces.
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['Radius: The distance from the center of the circle to its outer rim.', 'Chord: A line segment whose endpoints are on a circle.', 'Diameter: A chord that passes through the center of the circle. ... ', 'Secant: A line that intersects a circle in two points.']
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You can see that there are seven lines of symmetry, and the regular heptagon also has rotational symmetry order seven. The order of rotational symmetry and the number of lines of symmetry of any regular polygon is equal to the number of sides.
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What are regular and irregular shapes? Regular shapes have sides that are all equal and interior (inside) angles that are all equal. Irregular shapes have sides and angles of any length and size.