Define: a)Tangent; b)Secant; c)Convex Quadrilateral; d)Orthocenter of triangle e) An angle please answer immediately
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Tangent
In geometry, the tangent line to a plane curve at a given point is the straight line that "just touches" the curve at that point.
Secant
In geometry, a secant of a curve is a line that intersects the curve at a minimum of two distinct points.
Convex Quadrilateral
A convex quadrilateral is a four sided polygon that has interior angles that measure less than 180 degrees each.
Orthocenter of triangle
The three (possibly extended) altitudes intersect in a single point, called the orthocenter of the triangle
An angle
In geometry, an angle can be defined as the figure formed by two rays meeting at a common end point.
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