The theorem 11 straight line that is perpendicular and half breaking record of a circle going through the center of the circle.The theorem, any rectangle attached to 12 in a circle the size of the sum of the angles opposite equal 180 degrees.The theory chapter 131. in a circle, if two equally long record, record, record both the distance from the center point of the circle are equal in length.2. in a circle, if two record paths away from the center point of the circle are equal in length. And they both record the same length.
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