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 Equation:  A mathematical sentence that contains an equals sign.

Altitude to the Hypotenuse: Investigate the relationship between sides of right triangles when an altitude is drawn to the hypotenuse of a right triangle.

Equation of a Circle: Find the equation of a circle based on its radius, center, and locus of points.

Distance to a Point in a Rectangle: Find an equation that relates segments inside of a rectangle.

Equation of a Tangent: Find the general equation of a line that touches, but does not pass through, a parabola.

Efficient Fencing: Build a fence that will maximize a region surrounded by a natural boundary.