01. Introduction
02. Some Important Results
03. Arc of a circle and its length …
1) Δ PQR is an equilateral triangle. Find QSR and QTR.
Soln. Δ PQR is equilateral. ∴ ∠QPR = 600.
∴∠QSP = 600
☼ Circle and its tangent :
↦ Three collinear points cannot lie on a circle.
↦ If a line in the plane of a circle has common point with the circle, then there are two alternatives :
☼ Arc of a circle and its length :
☼ Some Important Results :
☼ Circle : The set of all the points of a plane, at a given distance from a given point of the plane, is called a circle. The given point is called the centre of the circle and the given distance is called the radius of the circle….