Circles
Your child will master the tangent, the single line touching a circle at exactly one point, and the theorems examiners love. Circles usually contribute about five marks, often a three-mark proof with a rider on lengths drawn from an exterior point. The chapter proves the tangent perpendicular to the radius at contact, counts the tangents possible from outside, inside and on the circle, and proves tangents from an exterior point equal in length. Neat diagrams carry the reasoning throughout. Three mistakes repeat. Students draw the radius to a random point instead of the point of contact. They c
Try a free lesson