If you have pain or discomfort in your feet or ankle joints, you might have flat feet. Keep reading to find out the difference between a normal foot and a flat foot. A normal arch creates an upward curve in the middle of your foot. Tendons and ligaments in your foot and lower leg help form the arch and stabilize it. Because your feet help support your entire body, having strong arches is important to your bodyâs health. When those tendons and ligaments weaken, your arch collapses.
A parabola (/pÉËraebÉlÉ/ ; pÉËrÃ¦bÉlÉ plural parabolas or, parabolae adjective, parabolic From: greek) ÏÎ±ÏÎ±Î²Î¿Î»Î® is a-two, dimensional-mirror symmetrical, curve which is Approximately-u shaped when oriented as shown in the diagram, below but which can be in any orientation in its. plane
A fixed line used in describing a curve or surface. âIn the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A â, B â, etc.â. âIt is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix.â. âThe directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse.â.