March 10, 2016 Coordinate Geometry, Grade 9, Math

Section Formula Consider the line joining the points A(x1,y1) and B(x2,y2). Suppose that we want to find the ratio of division of the line joining the points A and B at a point P(x,y) on it or we want to find the point of division of the line joining the points A and B in […]

March 9, 2016 Coordinate Geometry, Grade 9, Math

Regular Polygon Polygons are often defined by the number of sides that they have. A polygon is a flat shape with straight sides. A closed plane figure made up of several line segments that are joined together. The sides do not cross each other. A regular polygon is a polygon with all equal sides and angles.watch Regular Polygon Videos to […]

March 9, 2016 Coordinate Geometry, Grade 9, Math

VOLUME AND SURFACE AREA OF SPHERE A sphere is the set of all points in three-dimensional space whose distance from a fixed point O (the centre), is less than or equal to r (the radius). Every point on the surface of the sphere lies at distance r from the centre of the sphere. Watch SPHERE […]

March 4, 2016 Coordinate Geometry, Grade 9, Math

SPHERE A sphere is a solid geometric figure defined as the set of all points equidistant from a common center point. It is perfectly symmetrical, and its surface is uniformly curved, without any edges, vertices or faces. It is the shape made when a semi-circle is rotated around its diameter.watch Sphere Videos to learn more.. […]

March 3, 2016 Coordinate Geometry, Grade 9, Math

Mensuration Mensuration is a branch of mathematics that deals with the measurement of areas and volumes of various geometrical figures. Figures such as cubes, cuboids, cylinders, cones and spheres have volume and area. Mensuration deals with the development of formulas to measure their areas and volumes.watch Mensuration Videos to learn more. Mensuration is the skill of […]

March 3, 2016 Coordinate Geometry, Grade 9, Math

Height And Distances Some times we are required to find the height of a tower , tree, building and distance of a ship from light house, width of a river etc. We cannot measure them accurately , though we can find them using the knowledge of trigonometric ratio.watch Height And Distances Videos to learn more. […]

March 3, 2016 Coordinate Geometry, Grade 9, Math

DISTANCE FORMULA The Distance Formula is a variant of the Pythagorean Theorem.watch Distance Formula of points Videos to learn more. Distance between two points P(x1, y1) and Q(x2, y2) is given by: The Distance Formula is a variant of the Pythagorean Theorem that you used back in geometry. Given the two points (x1, y1) and (x2, y2), the distance between […]