Linear equation – STD 09

General form of linear equation ax + by + c = 0 where, a, b and c are real numbers. a and b are not equal to zero. x, y = two variables. A linear equation in two variables has infinitely many solutions. The graph of every linear equation in two variables is a straight…

Circles

CIRCLES Locus – moving points in a circle Focus – fixed point – centre of the circle Concentric circles Congruent arcs Properties of chords of a circle To prove AC = BC To prove OL = OM Proof:

Cubes

Level: STD 09 Problem 1 Find the LSA, TSA and volume of a cube of side 5 cm. Problem 2 Given TSA = 216 sq. cm a = ? Formula TSA = 6a2 6 x a2 = 216 a2= 216/6 = 36 Therefore, a = 6 cm Problem 3 Problem 4 Problem 5 Given Tank…

Sector

                  Minor arc                                                          Major arc What is sector? A sector is the part of a circle enclosed by any…