the three angles in a triangle add up to 180 degrees
opposite sides and opposite angles in a parallelogram are equal
the sum of two interior remote angles in a triangle is equal to the exterior angle
the square of the hypotenuse is equal to the sum of the other sides squared in a right angled triangle
an angle standing on a given arch touching the circumference is half the size of the angle in the center of the cicle

eworrall— 12/06/16