Or search by topic
O is the centre of a circle with A and B two points NOT on a diameter. The tangents to A and B intersect at C. CO cuts the circle at D and a tangent through D cuts AC and BC at E and F.
What is the relationship between area of ADBO and the areas of ABO and ACBO?
By inscribing a circle in a square and then a square in a circle find an approximation to pi. By using a hexagon, can you improve on the approximation?
Draw three equal line segments in a unit circle to divide the circle into four parts of equal area.