Addition of algebraic expression
To subtract a polynomial from another polynomial
To obtain angle bisector of an angle by paper folding
To verify that vertically opposite angles are equal
To verify that when two lines intersect, vertically opposite angles are equal
To verify that in an isoceles triangle, angles opposite equal sides are equal
To verify that the sum of any two sides of a triangle is always greater than the third side
To verify that in a triangle sides opposite equal angles are equal
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