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
One description of a parabola involves a point (the focus) and a line (the directrix). The focus does not lie on the directrix. The parabola is the locus of points in that plane that are equidistant from both the directrix and the focus.he point on the parabola that intersects the axis of symmetry is called the  vertex , and is the point where the parabola is most sharply curved. The distance between the vertex and the focus, measured along the axis of symmetry, is the focal length.