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Algebraic Proof

Finite Differences

Quadratic Relations

The Diagonals of A Parallelogram

The Properties of the Diagonals of A Rhombus

Sum of the interior angles of a polygon

Transform the standard form to the vertex form for a quadratic relation.

Analyze the properties of the graph by the quadratic relation expression

Identity Proving

Coordinates of Vertices of a Triangle

Prove the Trigonometric Identity

Is it possible to construct a triangle if we have known the exterior angles?

the point of intersection of the medians of a triangle

the line segment joining two midpoints parallel the side of a triangle and equal to the half of the side.

Radian

Quadratic Formula & Discriminant

Equation of a line

Right Bisector Equation

crossing multiplication Factoring（3）

crossing multiplication Factoring (2)

crossing multiplication Factoring（1）