June 13, 2022 – Saitech Informatics

Sets

Set is a defined as a collection of objects. Set of Natural numbers, N = {1, 2, 3,3 4, …..} Representation of Sets Roster form or Tabular form. E.g. A = {a, e, i, o, u} Set builder form. E.g. A = {x: x = vowel in English alphabet} Guided Practice: Fill up the blanks….

Light – Reflection and refraction

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Reflection Laws of reflection Spherical mirrors Properties of image formed by a plane mirror Problems based on reflection, concave and convex mirrors. Concave and Convex Mirrors Problem-1: An object of 5.0 cm in length is kept at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find…

Determination of atomic mass

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Atomic mass can be determined by applying the following formula. Atomic mass = (w1A1 + w2A2)/(w1+w2) If the weight is given in terms of weight percentage replace w1 as w1% , w2 as w2 % and (w1 + w2) as 100 respectively in the above equation.

Easy Multiplication by a number with repeated 9 with any number with equal number of digits.

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STD09

Lines and angles – Summary

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If a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and viceversa.This property is called as the Linear pair axiom. If two lines intersect each other, then the vertically opposite angles are equal. If a transversal intersects two parallel lines, then(i) each pair of corresponding angles…

STD09

STD09 Topics

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Maths Number system Polynomials Coordinate geometry Linear equations Introduction to Euclid’s geometry Lines and angles Triangles – Criteria for congruent triangles Quadrilaterals | Sketch Notes | Herons formula | Sketch Notes | Areas of parallelogram and triangles Circles Constructions Surface area and volume Statistics Probability Science Matter in our surroundings Is matter around us pure…