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                                                  Euclidean geometry grade 11 and 12 notes pdf
   You can do it! Let us help you to study smarter to achieve your goals. Siyavula Practice guides you at your own pace when you do questions online.Sign up to improve your marks Arc An arc is a portion of the circumference of a circle. Chord - a straight line joining the ends of an arc. Circumference -
   perimeter or boundary line of a circle. Radius (\(r\)) - any straight line from the centre of the circle to a point on the circumference. Diameter - a special chord that passes through the centre of the circle. A diameter is the length of a straight line segment from one point on the circumference to another point
   on the circumference, that passes through the centre of the circle. Segment A segment is a part of the circle that is cut off by a chord. A chord divides a circle into two segments. Tangent - a straight line that makes contact with a circle at only one point on the circumference. A tangent line is perpendicular
   to the radius, drawn at the point of contact with the circle. If \(O\) is the centre and \(OM \perp AB\), then \(AM = MB\). If \(O\) is the centre and \(AM = MB\), then \(A\hat{M}O = B\hat{M}O = \text{90}\text{°}\). If \(AM = MB\) and \(OM \perp AB\), then \(\Rightarrow MO\) passes through centre \(O\). If an arc
   subtends an angle at the centre of a circle and at the circumference, then the angle at the centre is twice the size of the angle at the circumference.Angles at the circumference subtended by the same arc (or arcs of equal length) are equal.The four sides of a cyclic quadrilateral \(ABCD\) are chords of the
   circle with centre \(O\). \(\hat{A} + \hat{C} = \text{180}\text{°}\) (opp. \(\angle\)s supp.) \(\hat{B} + \hat{D} = \text{180}\text{°}\) (opp. \(\angle\)s supp.) \(E\hat{B}C = \hat{D}\) (ext. \(\angle\) cyclic quad.) \(\hat{A}_1 = \hat{A}_2 = \hat{C}\) (vert. opp. \(\angle\), ext. \(\angle\) cyclic quad.) Proving a quadrilateral is
   cyclic: If \(\hat{A} + \hat{C} = \text{180}\text{°}\) or \(\hat{B} + \hat{D} = \text{180}\text{°}\), then \(ABCD\) is a cyclic quadrilateral.If \(\hat{A}_1 = \hat{C}\) or \(\hat{D}_1 = \hat{B}\), then \(ABCD\) is a cyclic quadrilateral.If \(\hat{A} = \hat{B}\) or \(\hat{C} = \hat{D}\), then \(ABCD\) is a cyclic quadrilateral.If \(AT\)
   and \(BT\) are tangents to circle \(O\), then \(OA \perp AT\) (tangent \(\perp\) radius) \(OB \perp BT\) (tangent \(\perp\) radius) \(TA = TB\) (tangents from same point equal) If \(DC\) is a tangent, then \(D\hat{T}A = T\hat{B}A\) and \(C\hat{T}B = T\hat{A}B\) If \(D\hat{T}A = T\hat{B}A\) or \(C\hat{T}B =
   T\hat{A}B\), then \(DC\) is a tangent touching at \(T\) If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. I wasn't sure how the handwritten
   notes would print, but they printed perfectly. Clear and concise notes, very satisfied - all I needed for my Term 3 test, along with solving problems from my textbook! Thank you.
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