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  2. Annulus (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Annulus_(mathematics)

    An annulus Illustration of Mamikon's visual calculus method showing that the areas of two annuli with the same chord length are the same regardless of inner and outer radii. [ 1 ] In mathematics , an annulus ( pl. : annuli or annuluses ) is the region between two concentric circles.

  3. Multiple integral - Wikipedia

    en.wikipedia.org/wiki/Multiple_integral

    Integral as area between two curves. Double integral as volume under a surface z = 10 − (⁠ x 2 − y 2 / 8 ⁠).The rectangular region at the bottom of the body is the domain of integration, while the surface is the graph of the two-variable function to be integrated.

  4. Integral - Wikipedia

    en.wikipedia.org/wiki/Integral

    Integration, the process of computing an integral, is one of the two fundamental operations of calculus, [a] the other being differentiation. Integration was initially used to solve problems in mathematics and physics, such as finding the area under a curve, or determining displacement from velocity. Usage of integration expanded to a wide ...

  5. Signed area - Wikipedia

    en.wikipedia.org/wiki/Signed_area

    The blue area above the x-axis may be specified as positive area, while the yellow area below the x-axis is the negative area. The integral of a real function can be imagined as the signed area between the x {\displaystyle x} -axis and the curve y = f ( x ) {\displaystyle y=f(x)} over an interval [ a , b ].

  6. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    The area between two graphs can be evaluated by calculating the difference between the integrals of the two functions. The area between a positive-valued curve and the horizontal axis, measured between two values a and b (b is defined as the larger of the two values) on the horizontal axis, is given by the integral from a to b of the function ...

  7. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    This allows the two congruent purple-outline triangles and to be constructed, each with hypotenuse ⁡ and angle at their base. The sum of the heights of the red and blue triangles is sin ⁡ θ + sin ⁡ φ {\displaystyle \sin \theta +\sin \varphi } , and this is equal to twice the height of one purple triangle, i.e. 2 sin ⁡ p cos ⁡ q ...

  8. 6 of the best and 6 of the worst Christmas movies on Netflix ...

    www.aol.com/6-best-6-worst-christmas-120901378.html

    The two groups must work together to save the lodge owned by the soldiers' former commander. Rotten Tomatoes Score: 77%. Why you should watch it: Critics said "White Christmas" is warm and cozy ...

  9. Fermat's spiral - Wikipedia

    en.wikipedia.org/wiki/Fermat's_spiral

    Let φ 1 = 0, φ 2 = 2π; then the area of the black region (see diagram) is A 0 = a 2 π 2, which is half of the area of the circle K 0 with radius r(2π). The regions between neighboring curves (white, blue, yellow) have the same area A = 2a 2 π 2. Hence: The area between two arcs of the spiral after a full turn equals the area of the circle ...

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